The first coach of Erling Haaland remembers when his former player burst into the wider footballing consciousness.
The forward had been scoring goals for Red Bull Salzburg in Austria, but he made his European debut in September, scoring a hat-trick in the first half against Genk.
The man who gave Haaland his first senior start in the Norwegian second tier was just 15.
That was the start of being a person everyone knows about. I, his coach from the early days, noticed that this was different.
Haaland became the first teenager to score in the first five games of a group game in the European Championship, and then left for the January transfer window, where he scored 28 goals in 22 league games.
Berntsen has seen Erling score the same goals for many years. He is always taking the next step.
The 21-year-old is on the move again, this time to Manchester City.
It is a big moment for a player who is considered one of the most exciting attacking talents in football.
In the south west of Norway, there is a small town called Bryne. It is where Erling's dad began his career and where the family returned after he left Manchester City.
Berntsen began to coach the young forward when he was eight years old because of his obvious promise, after Erling was three years old.
Berntsen says that he was something special because he developed his skills in four basics.
Erling from an early age was very good in technical, tactical and mentality, which is why top clubs look at him in two or three of these areas.
He has a brother who is five years older than him and he is strong and fast, so we knew the missing part in Erling's play would be his biggest strength. We knew he would have four out of four.
Four of the 40 players Berntsen coached went on to play for the national team at various levels, and Haaland was a part of that group.
Berntsen says that he had a passion for football but many kids have that. He was focused on football when he was on the pitch.
He learned from an early age how to behave as a footballer, how to behave in the dressing room, how important it is to have fun but to practise a lot.
He had perfect genetics and his family was good to let him think in a football way.
When he was 12 years old, we began to talk about how special he was because of his tactical skills, mental strength, and the fact that he would explode when he was strong and fast. He could have gotten bored of football.
The young forward stood out and scored goals at a regional and national level. In the first season he was on the senior team, he was the only one who struggled to find the net.
After scoring for fun in the reserves, Haaland was given 10 minutes of first-team action before Berntsen was named interim boss in May 2016 and went on to play 16 times that season without getting off the mark.
Berntsen says that he learned important lessons when he was just 15.
He played against strong men. It is important that he developed more robustly. If everything is going well, it is too easy to become good.
Berntsen says that the first of a series of very clever transfers that have since taken him to Red Bull Salzburg and then to Borussia Dortmund happened when Haaland moved toMolde.
Jan Age Fjortoft, who spent a large part of his career in England, had no doubt that Haaland and his team would make another wise choice when it came to his latest move.
It is good for every athlete, every human being, to have a good team, especially when you are doing things like Erling is doing, step by step, bigger and bigger. Fjortoft says it is good to have a dad or someone who has been there before.
I know how Team Haaland chooses his clubs, and they use a method. When he was at Salzburg, he said no to Juventus because it didn't fit his career, and when he was at Manchester United, he said no because it didn't fit his career.
They discuss these kind of things when they do the decisions now that they are a team.
Berntsen was the coach of Haaland when he was a teenager and he is confident that he will fit in well in his new environment.
The 6ft 4in forward has 85 goals in 88 games for the team and has been sought after because of his goal scoring ability.
The Germans used to call him a machine. Fjortoft, who now works as a journalist, does not think that a human is a machine.
Haaland is a tall, blond Norwegian who can score goals, is strong and has great technical abilities, but he is peaceful, like a Viking who came to the UK thousands of years ago. He is a goal-oriented person.
There was a time when the big number nines were out of fashion but now a lot of clubs see that they need that kind of forward - when you have all these quick players in and around the box, you need also this big number nine.
He is a very strong number nine and also very quick. He has the ability to play behind a back four or back three of any team, and in modern football, where counter-attacks are very important, he also fits that bill.
When Haaland was at Salzburg, Berntsen says the world's top clubs were slow to appreciate his potential.
If the big six or seven clubs in the world don't buy him, they will be making a big mistake, he says. He took everybody by surprise, but when we saw he was scoring so much, we thought the sky was the limit.
Fjortoft thinks the Norway international is one of the few players who can take Manchester City to another level.
Fjortoft believes that Manchester City need to take the next step in order to succeed.
He will see the players he can play with. It is great for a strikers to have those services.
Haaland has changed a lot since he made his first-team debut six years ago and despite Norway failing to reach this year's World Cup, the 21-year-old is being talked about as one of his country.
We have had some great number nines in Norway but in the history of football in our country, we have never had anyone so close to the top of the world.
At his best, he can compete with his generation's best players, so I think he has already passed the best we have had in Norway.
Despite his huge profile, Haaland still manages to find some quiet time when he returns to Bryne to be treated as one of the guys.
He is one of the group when he is with his friends, but it is more and more difficult for him because we have never had such a famous big sporting star like Erling.
We had Solskjaer in the late 90s, but he was a big player before social media. The interest in Erling is huge.
He is a fan of the team and it meant a lot to him to have his debut on the first team. He is back home with his friends and family when he has a few weeks off.
He will have some peace in our little town, but not in other places. He will be one of the guys if he comes home and chats with his friends.
Of course I am proud, we all are. I am proud of the group because they have become a good group of people. That is the most important.
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