That's pretty much the same situation like when de bruyne left from manchester city squad due to the injury. Im seeing liverpool is going to struggle against liverpool soon. Arsenal is still declining a lot compared to the previous season.
I can't really sure to say it as an opportunity owner by liverpool coz salah is the only key owned by liverpool to win the game. He was a hero for liverpool. Based on my prediction, it seems likely that the gameplay will be quite attractive since arsenal will be playing with a fully offensive strategy against their opponent.
If during Liverpool's match against Arsenal, Salah could appear with his club on the field, I'm sure Liverpool's chances of winning are very big compared to Arsenal, but I'm not saying that Arsenal is bad, it's just that the current conditions are superior to Liverpool and I really hope that Liverpool can beat Arsenal so that they can continue competing to maintain first position with Manchester City.
That being said, Liverpool manager Jurgen Klopp is one of the most experienced managers in world football and I believe he'll know what to do with the team now that Salah wouldn't be available four at least a minimum of three weeks. The club is currently at the top of the league table and I don't expect them to drop from the top during the time that the Egyptian will be away