The speculation around Erling Haaland's future is already intensifying ahead of the January transfer window but how has the BVB forward been performing this season?
After the recent win over Greuther Furth, Haaland appeared to wave goodbye to the fans of his former club, Borussia Dortmund, who had been linked with a host of top European clubs in recent years.
His agent, Mina Raiola, recently admitted there is a "big chance" he will move in the summer, when a £64m release clause in his contract reportedly comes into effect.
Haaland has scored 76 goals in 74 appearances since he moved from Red Bull Salzburg. We look at how he has performed this season.
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The goals are flowing despite the interruption.
Haaland scored a goal against Greuther Furth.
Haaland has had to contend with injuries. He missed three games at the end of September due to a muscular problem and was ruled out for a longer period in October and November due to a hip flexor issue.
He was expected to be out for December due to his hip injury, but he returned to action early.
He scored his first goal in two months seven minutes after he came on as a substitute in the game.
Since that strike, he has scored in five of the last six games, taking his goal tally to 19 in 15 appearances for the club.
Haaland is the top scorer in the league, and despite missing a large chunk of the season through injury, he has still scored 16 goals.
If Haaland keeps scoring with the same regularity, he may overtake that pair. His strike rate is the best it has been since he arrived from Red Bull Salzburg two seasons ago, as he is currently averaging a goal every 69 minutes.
Despite Haaland's efforts, they lag behind the leaders. They are nine points behind their rivals in second place. Without Haaland's goals, they would be nine points worse off.
They missed him during the group stage. Haaland was unavailable for the crucial meetings with Ajax and Sporting Lisbon because he was only able to start the first two games.
Haaland needs to wait for another chance at the European club competition.
Stats are going upwards.
Haaland has 13 goals in 10 appearances in the German league.
Haaland became the youngest player in the competition to reach 50 goals last month, at 21 years and six days old. He only made 50 appearances to reach the landmark.
Haaland, a frightening talent since he burst onto the scene at Red Bull Salzburg as a teenager, just keeps getting better.
Rose said that he's much improved compared to last season. He has better timing, finds good positions and makes the right decisions.
The movement and decision-making can be seen in his increased goal output, but it's the positioning Rose mentioned that explains how he has reached another level this season.
Haaland is spending more time in areas of the pitch where he can hurt opponents. The Norwegian is capable of causing damage, but it is in the opposition penalty box that he is the most dangerous.
He is getting more touches there this season, which is one of the most notable changes in his game. His average of touches in the opposition box per 90 minutes is up from last year.
His shot volume is the same. He is attempting 4.5 attempts on goal per 90 minutes, up from 3.5 attempts last season. His average of 2.2 shots on target per 90 minutes is an increase.
Haaland is giving his team-mates more bullets. He is creating more chances than at any point in his career and he is scoring more himself. His numbers for expected assists show the chances are higher.
The numbers show that a player is finding new ways to improve, and that should be frightening for clubs who end up missing out on his signature.
What has been said about him this season?
Emre Can talked about Haaland's influence.
The way Erling handles it as a young player is extraordinary, according to Marco Rose. All of us who work with him are used to it.
He's much improved compared to last season. He finds good positions and makes the right decisions.
Everybody knows about Erl's quality. He helps us as a team. The team has more confidence when he's on the field.
Every week, I stand here and tell you how great he is. The only thing I can say is that the player you see isn't a one-off. After a week on the sun bed, he doesn't just come back and play. He works on his game every day. He's a better guy than a strikers.
Robert Lewandowski is a great player. He has a lot of potential, but he's young.
He has the chance to become the best forward in the world in the future.
It's great to have a young player like him in the league. He wants to score goals.
He can be the best. It's not always easy when things are going well. He has scored a lot of goals and is very young.
Haaland is a special player, he's strong and quick. He's got all the skills to make a defender's life very difficult.
The first time he scored was at Salzburg. He was very quick. Haaland is a bit stronger than Vardy.
