Barcelona seized the advantage in their Champions League quarter-final tie against Manchester United after a 1-0 win at Old Trafford on Wednesday.
The only goal of the game came from a clever cross by Lionel Messi although Barca's captain was kept unusually quiet for the remainder, after being left with a bloodied face from a clash with United's Chris Smalling.
"Messi felt very uncomfortable after the blow to the head, we'll have to examine him tomorrow to see how he is, it was a strong blow, he has a large bruise," said Barca coach Ernesto Valverde.
Midfielder Sergio Busquets added: "It was a big blow, he has a scar and he bled a lot, it was obviously uncomfortable for him but he put on a brave face and played as best as he could, as he always does."
