There were worrying scenes for Manchester City fans when John Stone was injured in England's friendly against Belgium.
The defender stopped in the eighth minute of the clash at Wembley and was replaced by Joe Gomez.
In a moment of indecision, Stones tripped and landed awkwardly after losing the ball, then fell to the ground and received treatment.
The news will worry his club, Man City, which faces Arsenal in a titanic Premier League fight on Sunday.
The Stones' gestures weren't exactly positive either, heading straight down the tunnel and then emerging in the second half stone-faced.
City have already seen a key defensive partner Kyle Walker He was injured in England's previous match against Brazil.
Walker left the England camp with a suspected hamstring injury against Brazil, but Sky Sports has since it was claimed that the problem is not considered “too serious.”
That means he could play against Arsenal, and City are hoping for a similar diagnosis for Stones.
However, City have not had the best international break, with Ederson, Jack Grealish and Kevin De Bruyne avoiding work due to problems.
To complicate matters further, key defender Manuel Akanji also suffered a knock while playing for Switzerland and was left out of the squad for the friendly against Ireland.