Bayern sporting director Matthias Sammer is impressed with how midfielder Arturo Vidal has adapted to the club's style and shape this season.
Vidal joined the Bundesliga side from Juventus, who play a very different pattern, at the start of the season, but has steadily grown into a vital component of Pep Guardiola's team.
The Chile international netted in both legs as Bayern overcame Benfica in the quarter-finals of the Champions League to join Real Madrid, Manchester City and Atletico Madrid in the final four of Europe's elite club competition, and Sammer is delighted by his progress throughout the campaign.
"He came here after the Copa America with no preparation with the team," he told Sky Sports. "He was good in the first half of the season and now he is in much better shape. He is there for us now. He had already two yellow cards but played very responsibly."
The former Ballon d'Or recipient also revealed star striker Robert Lewandowski was involved in a car accident prior to the match on Wednesday night.
"Accidents happen to a lot of people, but you only rarely see prominent footballers involved." Sammer said. "He is doing alright. These kinds of things happen. It was a minor accident. These things happen, but it did not have any influence on Guardiola's decision."
The Bavarians continue their quest for a historic fourth consecutive Bundesliga title when they welcome Schalke to the Allianz Arena on Saturday evening. They currently hold a commanding seven-point lead over second-placed Dortmund with just five games of the season remaining.