“They have got away with it up until now, but when you start coming under pressure and results aren’t going your way, that’s when that can get strained.
“There really is a bit of problem between the two players.”
Salah was substituted off by Jurgen Klopp during Thursday night’s defeat against Chelsea at Anfield, and appeared to strop as he came off the pitch.
Afterwards, his agent tweeted out a full stop, fuelling speculation he could leave. And Sinclair explained that Salah’s reaction shows his way of thinking towards the game.