England and Arsenal winger Alex Oxlade-Chamberlain is a doubt for the opening World Cup group game against Italy and for the remainder of the tournament after the FA confirmed he suffered a medial knee ligament injury in the warm-up draw against Ecuador.
England football's governing body are yet to reveal which grade the injury is but early reports suggest the 22-year-old will be out for two weeks.
The England medical team will continue to assess the midfielder's injury in the build-up to their Group D opener against 2006 winners Italy on 14 June.
Oxlade-Chamberlain underwent a scan on Thursday to learn the extend of the injury after going off in the second half of England's 2-2 draw in Miami following an off-the-ball kick from Ecuador's Carlos Gruezo.
The 20 year old is out of the final warm-up match against Honduras this weekend but it remains to be seen what role he will be able to play in group games against the Azzurri, Uruguay and Costa Rica.
Manager Roy Hodgson is ready to give Oxlade-Chamberlain every chance to prove his fitness ahead of the rest of the tournament having not yet called up a replacement after the Arsenal wideman produced an impressive display against Ecuador in his first appearance for over six weeks.