Ajax winger Viktor Fischer will be out of action for at least six weeks with a hamstring injury, the club has confirmed.
The Danish forward has been a regular this season under coach Frank de Boer but, after limping out of Sunday's 4-0 win over AZ on Sunday, tests have confirmed a tear in his muscle.
The 19-year-old has made 35 appearances for the Eredivisie champions this season, scoring seven goals, but is now set to miss a large part of the remainder of the campaign including the Europa League match against Red Bull Salzburg on Thursday and Sunday's clash with fierce rivals Feyenoord.
"On Sunday in the match against AZ, Viktor Fischer sustained a tear in his left hamstring," a statement on the club's website read.
"The Danish forward has been ruled out for at least six weeks.
"In a few weeks he will have another test to see how the hamstring is recovering."
Fischer joins a growing injury list at the Amsterdam Arena, and the club do not expect Lasse Schone, Thulani Serero or Nicolai Boilesen to be available for their important upcoming fixtures.
The statement continued: "Lasse Schone has a torn ankle ligament. He is recovering well, but will not travel to Salzburg [in the Europa League on Thursday], and the match against Feyenoord [on Sunday] will probably come too early.
"Thulani Serero flies to Salzburg but is not in the squad. The South African has been struggling with a groin injury and will continue his rehabilitation.
"Finally Nicolai Boilesen has a left hamstring injury and is therefore not available in the upcoming weeks."
Ajax are six points clear at the top of the Eredivisie, and will look to turn around a three-goal deficit in their Europa League last-32 clash with Salzburg on Thursday.