Sinclair, who played for West Ham and Manchester City during a fine professional career, has now given his thoughts on the relationship between Salah and Mane.
Speaking on talkSPORT, Sinclair said: “I feel there's been a massive problem which has plastered over the cracks with Salah's relationship with Mane.
“I feel Mane is a huge team player and Salah is more for himself and that's been a relationship problem for a long time for Liverpool.
“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 wasn't happy.
“It's always difficult when you go to a former employee and you get brought off. Pride-wise, that would have hurt.
“His agent put a tweet out with just a full stop, I don't know whether that means that's the end or what. It was a bit encrypted.
“It's disappointing because obviously he wants the Golden Boot, he's got good numbers this season and getting pulled off is not going to help his cause.
“As selfish as that might sound, he wants to play and score goals for Liverpool."