I don't see the point in this. All they're doing is likely risking further injury. If he's not fully fit or healed then he should just sit this tournament out.
How can you not? Its the FIFA WORLD CUP. It happens once in every 4 years. Obviously Egypt are trying their level best to make sure that Salah becomes to fit to play,because their entire hopes are sort of relied on him. He had a terrific performance in the Champions League until Ramos decided to fuck up his dreams. He is in form and hence,Egypt wants him to play for the world cup,or chances are that they might get kicked out. 
They shouldn't put him at risk and there's going to be so much pressure on him to play but if he plays not fully fit or whilst still inured he could just do more damages to himself. If he plays and plays terrible and then sustains further injury or damage then that's not going to help anyone.
host russia is able to make a mental drop opponent, because russia must play maximally, let alone be in the cage itself most likely the Russian team is better than saudi arabia.surely there will be many people who bet on choosing Russian team to win the game
Russians are actually quite famous for losing crucial matches against weak opponents. I would expect Russia to win their match against Saudi Arabia, but won't be much surprised if they lose it.
I doubt they'll lose this one. Saudi are probably one of the worst teams in the torunament and they're in their home country remember. They'll probably get out of their group but can't see them going further than that.