The 21-year-old, who signed from Nordsjaelland this summer, has been ruled out for an extensive period after suffering cruciate ligament damage in his knee.
Aston Villa defender Jores Okore has been ruled out for up to nine months with a knee ligament injury.
The Denmark international hobbled off after just 30 minutes of the 2-1 defeat against Newcastle United on Saturday following an innocuous challenge on Loic Remy. After undergoing tests to determine the extent of the problem on Monday, the center back has now been told that he has suffered cruciate ligament damage that requires surgery.
A statement from Aston Villa on its official website read: "Following clinical examination and the results of an MRI scan, the club can confirm that Jores Okore sustained a ruptured anterior cruciate ligament injury in his right knee in the game against Newcastle on Saturday.
"Jores will undergo surgery in due course and he could be sidelined for a period of up to nine months."
The news comes as a huge blow to Villa boss Paul Lambert, who only signed the player this summer.
Okore, 21, arrived on a four-year deal from Nordsjaelland in June for a fee believed to be in the region of 4 million pounds and won high praise for his early Premier League performances.