Marco van Ginkel was substituted during Chelsea's win over Swindon Town in the Capital One Cup after going down awkardly on his knee just six minutes in.
Now a scan has revealed the worst possible results and the midfielder could be out for the rest of the 2013/14 season.
Dutch website AD.nl reports that a scan has revealed Van Ginkel has torn his anterior cruciate ligament (ACL), with their news source the player's agent Rob Jansen.
It is a terrible blow for the young midfielder, signed from Vitesse Arnhem in Holland for £8 million over the summer.
Van Ginkel hoping the move could propel him into Holland's senior internationals squad on a regular basis, crucially into the World Cup squad for next summer.
That now seems a distant dream and it is likely Van Ginkel may not play again the whole season, with surgery on the injury imminent.
For Chelsea the news could mean an increased role for Michael Essien, or even cause Jose Mourinho to revisit the idea of David Luiz in central midfield, despite his statements otherwise prior.
What do you think of the news?
image: © Jason Bagley