Theoretically, Al-Ittihad and Salah (he seems to want to move to the Saudi League) have 20 more days to convince Liverpool to agree to a transfer. The transfer window in Saudi Arabia closes later than in most European countries. But the likelihood that Liverpool will agree is close to zero - now they can not replace Salah with another big transfer until the winter window (actually until the summer).
I don’t think Liverpool actually want to spend a good amount of money right now. And finding a suitable substitution for Mohamed Salah is definitely a big task for them if they actually sell him. So I am pretty sure that they do not want to take that risk right now. They would rather wait to see how he is going to perform and take decisions accordingly. That’s why I believe they are refusing to let him go even though they are being offered a good price for him. And let’s be honest, this much price is not going to be offered by any European club for sure, especially in the next transfer window.
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The transfer window in England closes tomorrow night, so Liverpool won't have time to find a replacement if they don't have an agreement right now.
Nevertheless, leaks say that an agreement has been reached and Salah will leave Liverpool one of these days. Judging by previous leaks, the amount of the transfer will be about 150 million pounds.