Two years after leaving the club for the English top flight, Timo Werner is expected to sign a permanent deal with the club.
The London club met the Germany international's release clause in 2020 but will make a loss with him returning in a deal thought to be around £25m.
There was a picture of the man arriving for a medical.
He scored 23 goals in 89 games for the club, helping them win the European title.
He was one of the most sought-after forwards in Europe when he joined the Blues in the summer of 2020.
During his first stint at the club, he scored 95 goals in 159 games.
In the English top flight, he netted just 10 times.
He scored in the second leg of the semi-finals against Real Madrid to help propel the Blues to European glory.
A permanent deal has been reached between the club and Werner, who was on a loan at the time.
During the pre-season tour of the United States, Thomas Tuchel said he would be one of the happiest people on the planet if he signed a new contract with the club.
It is believed that he is one of the most popular players at the training ground, but he could not score enough goals to make a difference.
He was praised by the club's fans for his effort despite the pressure he was under.
Benjamin Sesko will stay at Red Bull Salzburg until July 2023 and sign a five-year contract with the club.
Sesko said the club's philosophy of placing trust in young players and playing attractive, attacking football made it a perfect fit for him.
The city, the stadium, and the many good discussions with the club convinced me that this move is the right one.