West Ham boss Alan Curbishley was full of praise for two-goal Dean Ashton after their victory over Wigan Athletic.
Ashton went off in the 73rd minute after appearing to strain a hamstring taking a free-kick.
"We've just got to hope it's only cramp. With Craig Bellamy and Kieron Dyer still out it's the last thing we need from our point of view - to see Deano out as well."
The Italian gave Ashton his first England cap against Trinidad and Tobago at the end of last season after the former Crewe and Norwich striker's comeback from breaking an ankle a year earlier, while training with Steve McClaren's England squad.
Curbishley continued: "He has done ever so well and is in a real run of goals, scoring six in five pre-season friendlies after his late burst last season.
"He's leaner, too. He's worked hard and has been on a different diet. It would be a real shame if he's got another injury now but I think he'll be all right."