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.