Carl Jenkinson is set to miss the start of the new Premier League season with West Ham after picking up an injury in Sunday's friendly against Malaga.
Jenkinson, who has signed for the Hammers on a season-long loan from Arsenal, injured a hamstring in the 2-0 defeat and will have a scan to determine the extent of the damage.
West Ham midfielder Mark Noble told Sky Sports News: "Hopefully it is not too bad because we need players like that fit for the start of the season.
"It was a precaution to take him off and we have two more games before we start the season with a tough one against Tottenham."
With first-choice right-back Guy Demel also injured, manager Sam Allardyce will be hoping that Jenkinson's injury does not prove to be too serious.
The defeat to Malaga was West Ham's third loss in four pre-season games and they are next in action against Sampdoria at Upton Park on Saturday.