Manchester United winger Antonio Valencia has been ruled out for a month following a hamstring injury picked up in Thursday's Europa League win at Ajax.
The Honduran was taken off after he had played a significant part in creating the second goal of United's 2-0 victory, scored by Javier Hernandez.
He is now expected to miss up to four weeks, according to the club's official website.
United host Ajax at Old Trafford in the second leg next Thursday.