Dele Alli was among the first players to arrive at Finch Farm as Everton began pre-season training on Thursday.
The 27-year-old has endured a tough time over recent years and his loan at Turkish side Besiktas came to an early end last season through injury.
The former Tottenham Hotspur star had joined the Super Lig club after he was deemed surplus to requirements by then Blues boss Frank Lampard after failing to take advantage of some summer opportunities last year and cement a place in his first team.