Chelsea defender John Terry was stretchered off in the club's Champions League win away to Maccabi Tel Aviv.
The Blues recorded an impressive 4-0 victory, but Terry's injury was a reason for fans to be concerned.
Terry appeared to have picked up a foot injury, and was unable to continue the game, with his replacement Kurt Zouma going onto score.
The injury makes him a doubt for Chelsea's important Premier League clash this weekend against Tottenham Hotspur.
Terry had mixed success against Harry Kane last season, keeping him out in the Capital One Cup final, but unable to prevent him scoring a hat-trick at White Hart Lane.
The former England captain's absence would mean Kurt Zouma and Gary Cahill would be likely to deputise at Stamford Bridge.
Chelsea have kept two clean sheets in succession, and are looking to start climbing up the table after a horrendous start to the campaign.