Liverpool forward Salah and Manchester United midfielder Paul Pogba have both mixed starts to the new campaign.
Salah scored 44 goals last season but his second campaign with Liverpool was far tougher. Pogba, meanwhile, has a precarious relationship with Jose Mourinho - something many believe has contributed to his struggles.
Former Liverpool and Manchester United midfielder Paul Ince believes the World Cup in Russia may be down to their struggles.
He told Express Sport
: “Yeah, Salah’s struggling, but he’s an outstanding player.
“You can’t drop him as you need to keep those three (Salah, Roberto Firmino and Sadio Mane) together.
“He was injured at the end of last season and maybe wasn’t fully fit for Egypt.
“I know Pogba was great for France but he’s not been as impressive for United.
“That could be because of the World Cup.
“I’ve played in these tournaments and they’re far from easy. They’re draining and can be exhausting."