The South Africa international has been in superb form following his return to Goodison Park, with the Tottenham midfielder on loan at the Toffees until the final day of the campaign.
Moyes though, ever the straight shooter, has no intention of discussing another club's player, and says any confirmation of the former Ajax Cape Town ace's future will only be made public at the end of the term.
Speaking after the Merseysiders' 4-0 drubbing of Fulham on Saturday, Moyes said: "You're probably going to ask me at every press conference and I'm going to give the same answer that I genuinely don't think anything will be even talked about until after the end of the season."
Everton are next up in action against Stoke City on Tuesday, followed by a trip to Wolves before bringing down the curtain on the season at home against Newcastle.