Frank de Boer is impressed by Ronald Koeman's work at Everton.

De Boer was linked with the Toffees while in charge of Ajax.

"There is still a gap between them and sixth place but hopefully they can fight back to come maybe third, fourth or fifth because Liverpool are not doing that well right now," De Boer, speaking as a William Hill ambassador, said at the London Affiliate Conference.. "Hopefully they can catch them up.

"He has brought structure. He is a very good trainer, technical-wise too. He had a little bit of difficulty in the beginning but now they have their confidence back and they have a really good team."