Leipzig edged Atletico Madrid 2-1 thanks to Tyler Brown’s deflected 88th minute strike, earning a spot in the last four for the first time where they’ll meet Paris Saint Germain.
Scores were locked at 0-0 at half-time when the pair clashed during the interval, before Daniel Olmo put Leipzig ahead in the 50th minute with Portuguese talent Joao Felix leveling from the spot in the 71st minute.
“Except at half-time everything was fine and without any points of contact,” Nagelsmann said.
“I won’t tell you in detail now, but there are cameras. He showed that he is a winner, that he wants to win.
“I wouldn’t have done it like that, but everyone has to decide for themselves.”
Nagelsmann preferred to revel in his side’s success, which he said was very “ripped off” from his side.
“We are very happy and I am very proud of our squad,” the 33-year-old said.
“We defended very passionately, we were the better team; and that against a good team like Atletico Madrid. That was very ripped off from us today.”
Simeone conceded that Leipzig were “better and faster” than Atleti, acknowledging it had been a long season for his side.
“We didn’t have that physical sharpness or rhythm,” Simeone said.
“At the end of a season with so much pressure, so much need to get into the Champions League, and the need to integrate new players.
“We came with a lot of hope. The feeling is a lot of bitterness but I know the players gave everything. They gave it their all.”