Manchester United manager Jose Mourinho said there were fears his players would suffer injuries on Young Boys Bern's artificial pitch and questioned UEFA's willingness to accept such surfaces.
United beat Young Boys 3-0 in their Champions League Group H match on Wednesday and while upbeat about his team's performance the Portuguese manager took aim at the pitch.
"Now I can say, I don’t understand how you can play the best club competition on artificial pitch," said Mourinho, who had declined to comment on the surface before the game.
"You know, probably some fear injuries. I had some players after training yesterday – light training – and they were feeling ankles, back pains, sore.
"It’s not easy, especially not for people who are not adapted to it. Also a little bit of a fear in the duels.
"People are used to great surfaces in England, always watered if not rain – the clubs they provide the water and the football is much more beautiful that way," Mourinho said.
Before the game, Mourinho had urged his team to follow the example of Swiss tennis great Roger Federer and show they were capable of winning on different surfaces.
Italian champions Juventus and Spain’s Valencia will also visit Bern in Group H.
Mourinho praises Pogba, Shaw, Dalot after United Swiss stroll
Manchester United manager Jose Mourinho heaped praise on captain Paul Pogba and full backs Luke Shaw and Diogo Dalot after they shone in a 3-0 win at Champions League debutants Young Boys Bern on Wednesday.
France World Cup winner Pogba scored two goals and assisted compatriot Anthony Martial's third while Shaw and 19-year old Dalot, making his United debut, looked solid on the flanks after a stormy opening 30 minutes.
"I felt Paul was a bit tired in the last part of the game, but he was class," Mourinho told BT Sport.
"He gave the team the pace we needed at times, keeping possession and keeping control of the tempo. The goal was good, and the penalty showed personality."
Pogba opened the scoring with a sublime left-footed finish in the 35th minute before calmly drilling in a 44th-minute penalty.
He carved Young Boys open with a defence-splitting pass which presented Martial with a simple finish at the near post in the 66th minute.
Close-season signing Dalot, who missed the start of the campaign with a knee injury, showed pace going forward and delivered several good crosses from the right.
Shaw, often criticised by Mourinho last season for below-par performances on the left, has looked more consistent and confident this term.
"I thought Dalot was very good, but I prefer to speak about both full backs," said Mourinho.
"Shaw played like he has done since the start of the season. Dalot is one of the best right backs in Europe already. He has a lifetime to play for Manchester United."
The United boss was also pleased with the overall display.
"Job done. Not phenomenal but good enough. After the first goal the game was in control -- after that, it was just a question of scoring the goals to give us the stability we needed for the second half," Mourinho said.