Real Madrid defender Sergio Ramos has insisted that there is no margin for error in the Champions League.
Manchester United striker Danny Welbeck got ahead of Ramos to head the Premier League leaders into the lead and the Spanish international has admitted that he was at fault for the goal.
Ramos told reporters: "He got the better of me but it was not a corner in the first place, that is certain.
"The margin for error in the Champions League is tiny."
The match at the Bernabeu finished 1-1, with the second leg taking place at Old Trafford in three weeks' time.
