U.S. international striker Jozy Altidore was forced from AZ's match at NEC Nijmegen with a head injury in the 34th minute.
Altidore was battling for the ball with NEC's Pavel Cmovs when he slipped on the wet pitch and fell into the ad boards, hitting his head. The striker was down on the pitch for a minute before he was able to slowly walk off.
AZ went on to draw the match 1-1, falling into fifth in the Eredivisie and out of any European position. The team will finish its season Sunday against Groningen.
Altidore has scored 15 goals in the league and 19 total this season, making it by far his most successful campaign in Europe. The 22 year-old is slated to join the U.S. national team in two weeks, as it prepares for friendlies against Scotland, Brazil and Canada, followed by the beginning of World Cup qualification.