Roma winger Mohamed Salah isn't expected to undergo a medical at Liverpool until Thursday.
The Egypt international flew into London on Tuesday night ahead of his club record move from Roma to Anfield.
The Liverpool Echo says Salah has yet to arrive in Liverpool to complete the formalities as he irons out the final details with the Serie A outfit.
The hope is that a deal, which with add-ons will exceed the £35million the Reds paid Newcastle United for Andy Carroll in 2011, will still be announced before the end of the week.
Salah, who scored 19 goals for Roma last season, is expected to pen a five-year contract.
He will become Liverpool's second signing of the summer after they agreed a deal for out-of-contract Chelsea youngster Dominic Solanke.