Jose Mourinho criticised his Manchester United players for showing off "PlayStation football" against Basel despite a 3-0 win to open the Champions League on Tuesday.
United, playing their first Champions League fixture since December 2015, secured a comfortable win with goals from Marouane Fellaini, Romelu Lukaku and Marcus Rashford on a night marred by a first-half hamstring injury suffered by midfielder Paul Pogba.
But despite his team's healthy winning margin, Mourinho claimed he was unhappy with the performance of his players following Lukaku's goal early in the second-half, which put United 2-0 up.
"Three points are important at home. Until 2-0 we were very stable, we played with confidence," Mourinho said.
"After 2-0 everything changed. We stopped playing, we stopped thinking, we stopped playing seriously, stopped making the right decisions on the pitch.
"We could have put ourselves in trouble, but they didn't score and we got the third.
"But it was bad decisions, fantasy football, PlayStation football, flicks and tricks. When we stop playing seriously, stop playing as a team, I don't like it."
"We gambled and you have to respect your opponent. I don't know if goal difference will play a part. We lost position, our shape, we lost balls in easy situations.
"I didn't like it, the players relaxed too much."
Mourinho was unable to give a definitive update on Pogba's injury, with the £89m signing expected to miss the weekend clash with Everton at Old Trafford.
But Mourinho admitted he does not yet know the full extent of the Frenchman's injury.
"From experience, and feeling it, I think it's a hamstring," Mourinho said. "Big? Small? I don't know, but hamstring for sure."
And Mourinho continued to back Fellaini, who found the opening goal just 16 minutes after coming on.
"I keep saying the same about Fellaini," the manager said. "He is a player with special qualities and he gives me multiple areas of action. He is one of my most important players."