West Ham United manager Slaven Bilic has said the club will make a decision on whether Andre Ayew needs to undergo a thigh operation.
Record signing Ayew, who arrived from Swansea earlier in the summer, suffered an injury in the 2-1 defeat to Chelsea at Stamford Bridge on Monday.
He could face up to four months on the sidelines, and Bilic told a news conference: "For Andre Ayew there are two solutions, one with surgery and one without. We are going to decide which one soon.
"He could be out for two and a half months or up to four. It shouldn't be more. He could be back this year, and we just have to hope."
West Ham play their first Premier League game at their new London Stadium home against Bournemouth on Sunday, and Bilic said he wanted to secure their first win there as soon as possible.
"Hopefully that will come on Sunday," he added. If it's packed and we play good football, it will guarantee the atmosphere will be great."