Aston Villa midfielder Idrissa Gueye has passed his Everton medical.
ESPN says Gueye has completed a medical at Everton ahead of a £7.1m deal.
The midfielder is on the verge of signing terms on Merseyside.
Everton triggered Gueye's release clause and have acted fast to get in ahead of other interested parties.
The defensive midfielder could become only Koeman's second signing of the summer after goalkeeper Maarten Stekelenburg if he pens the deal, with the announcement tipped to come by the end of the day.