Idrissa Gana Gueye is back to his best since returning from the Africa Cup of Nations, says Ronald Koeman.
The Senegal international has made a big impact at Goodison after joining the Blues from Aston Villa last summer, impressing fans and pundits alike with a series of all-action displays in the centre of midfield.
The 27-year-old ball winner has made more tackles (101) than anyone else in the Premier League this season, despite missing a month of the campaign due to the Africa Cup of Nations in January.
Gueye has even eclipsed Chelsea's N-Golo Kante, who is widely regarded as one of Europe's most effective defensive midfielders following his exploits with Leicester City, where he was central to the Foxes' remarkable title triumph last season.