West Ham talisman
"We know how important Marko is for our team," West Ham manager Manuel Pellegrini said following their match with Cardiff, as quoted by the BBC.
"We have too many players injured in a month that we have to play seven games and then in January, six more games.
"But I always have the same answer - we have a squad and it is a chance for another player to demonstrate why they are here."
Arnautović, a Champions League winner following his time at Inter, has made 14 appearances across all competitions so far this season and he currently sits alongside the likes of Álvaro Morata
Pérez's recent turn of form will offer fans some hope that they can get through the next few weeks without their star striker, although West Ham will demand that Javier Hernández