Meanwhile, Everton have concerns over the fitness of Tony Hibbert and Joseph Yobo ahead of the new season.
Right-back Hibbert ruptured his medial ligaments in the penultimate game of last season against Arsenal and faces an anxious wait to see if he will require surgery.
"I'm hoping for the specialist to say that I won't need an operation and I just want to kick on from where I am now," Hibbert told evertonTV.
"We didn't realise at first how bad it was and then the specialist said it was bad - but it's just one of those things."
Yobo has revealed that he has been suffering from an ankle knock while on international duty with Nigeria this summer.
The defender said he has been playing through the pain for his country but is confident he will be fit in time for Everton's Premier League opener against Blackburn on 16 August.
"What many people don't know is that I have been playing with an ankle injury," he confirmed.
"I was supposed to rest it but we had crucial games to play and we were short at the back so I was needed because of injuries so I just had to force myself to play.
"The medical team here in Nigeria have been great and they helped me to manage it for this period.
"Now I have to give it the rest it needs so I can be ready for pre-season training with my club."
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