Newcastle United is reportedly expecting Liverpool to table an official transfer offer for striker Alexander Isak, following the approval of Luis Diaz's $88 million (£66 million) move to Bayern Munich.

In recent days, it has been reported in the national press that Liverpool are willing to make a British record transfer offer to sign the Sweden international. And Collymore, who played for the Reds between 1995 and 1997, believes it is only a matter of time before Isak makes the move to Anfield.