West Ham forward Marko Arnautovic could miss the Premier League's festive schedule after announcing that he will be "out for a while".
Arnautovic limped off late in the first half of West Ham's Premier League win at home to Cardiff City on Tuesday, in which his replacement Lucas Perez scored twice.
The Austria international appeared to pull his hamstring and announced his injury setback in a social media post the day after the Cardiff win.
"Thank you so much for all your messages," Arnautovic wrote on Instagram.
"I will be out for a while, but I will do everything to come back strong and quick."
Get well soon, Arnie pic.twitter.com/uv4WiQNe6X— West Ham United (@WestHamUtd) December 5, 2018
Arnautovic has been linked with a move away from West Ham, the 29-year-old's brother and agent Daniel naming Everton and Chelsea as potential suitors, with Manchester United also reportedly interested.
"Marko feels extremely comfortable at West Ham. You can see that every week," the striker's representative said. "But you also get the feeling this cannot be the end. He's ready for the next step.
"Someone like him should not be fighting against relegation but playing for the best seats and for the international places."
Their 3-1 victory over Cardiff saw West Ham follow up their win at Newcastle with another three points, moving Mauricio Pellegrini's side up to 12th in the table.