Left on the bench for their draw at Leeds on Saturday, Salah spoke to reporters afterwards and accused someone inside the club of wanting to push him out. He also declared having "no relationship" with manager Arne Slot.
Hassan posted to X: "As footballers, when we get benched, we feel it, deeply sadness, frustration, even a bit of depression.
"But we wait for that moment to come on, to make an impact, to show the coach why we deserve to start. That’s the reality for most of us.
"But Mo Salah isn’t 'most of us'. Mo is in a different category like Cristiano and Messi. Players like that don’t get benched.
"And if, for any reason, they start on the bench, you must make sure they’re the first to come on, 60 minutes, 65 minutes maximum… not 'not even coming in'. That’s just disrespectful to everything he’s done for the club.
"Mo is not just a team-mate, he’s a brother, a leader, and a legend for club and country. Brother, every situation in life is temporary. Moments like this pass. What stays is your greatness and your response."