Salah was dropped to the bench by Klopp before eventually coming on. However, the Egyptian verbally clashed with his manager in the second-half.
After the 2-2 draw, former Reds striker Crouch said: "It didn't look good, I don't think it looks good for the club.
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"Mo Salah is a player who has started the majority of games for Liverpool and he will be fuming to be on the bench.
"But no-one likes to see this between a manager and a key player."
Stephen Warnock also said: "It is not good to see at all.
"You have two people who are equally important to the football club.
"The connection between the two has to be of respect and respect how they have helped each other's careers.
"With Mo Salah being pushed out a little bit he doesn't like that - it is a clash of egos."
Later, Klopp insisted: "No (I can't say what was said), but we spoke about it already in the dressing room. That's done."