Arsenal boss Wenger: Premier League depth hurt clubs in Europe
Instead, he says: "The competition in the Premier League has become much harder and the big teams in the Premier League paid for that in the Champions League."
He added: "You cannot afford any more, against anybody in England, to rest your players before a Champions League match. The physical demands in the Premier League are just so high that you go into the Champions League in March and April having lost your best players or already having exhausted them.
"The Premier League is too demanding. What other leagues can do, we cannot afford to do. I do not believe at all that the Premier League has become weaker.
"It was an exception from us because we played against a stronger team (Barcelona) and you have to accept that. They were better than us but under normal circumstances Manchester United would have gone through and Chelsea as well."