Amsterdam, Netherlands – Ajax defender Nicolai Boilesen will 0 defeat to Manchester United in the Europa League on Thursday.
Boilesen has battled hamstring problems throughout the season and he made his first appearance for the Amsterdam side since September on Thursday when he entered the match as a second-half substitute in place of Dico Koppers.
But following the match, Ajax boss Frank de Boer revealed the 20-year-old Boilesen would be spending more time out of the lineup.
"He has a problem with his hamstring again," De Boer told De Telegraaf.
"Only this time it is in another place. We have to be very careful with him."
The Denmark international has been ruled out of this weekend's match with NEC, although no further timetable was given.
Injuries have limited Boilesen to just four league games so far this campaign.