Chelsea have agreed a transfer fee with Mohamed Salah from Basel and the Egyptian, who has scored 17 goals in 27 appearances for his country, will complete his switch to the English Premier League side subject to agreeing personal terms and passing a medical.
"The move is subject to the Egyptian international agreeing personal terms and completing a medical examination."
Providing the deal, reported to be worth £10m, is wrapped up quickly, Salah could make his debut in Sunday's FA Cup fourth round tie against Stoke at Stamford Bridge.
Salah, compared in some quarters to Barcelona star Lionel Messi, will become Chelsea's third signing of the January transfer window following the arrivals of Bertrand Traore and Nemanja Matic.
Mourinho decided to move for Salah after being impressed by his performances for Basel in two victories over Chelsea in this season's UEFA Champions League group stages
Salah scored in three of the Swiss side's four recent meetings with Chelsea -- a goal in each of this season's Group E Champions League wins and also netting in the second leg of last term's UEFA Europa League semi-final when the Blues were managed by Rafael Benitez.
Salah joined Basel in 2012 from Egyptian Premier League side El Mokawloon after impressing the Swiss side during their friendly against Egypt's U-23 side.