The South Africa international is in the final year of his contract with the Toffees and has so far failed to agree a new deal.
"I don't know," the 28-year-old, who has been linked with Tottenham, told Sky Sports News when asked about his future. "I am still focused on staying at Everton. The season is not over yet, so anything can happen."
He added: "I can't comment on that (Tottenham speculation), I don't know what is going on.
"The media in England is big and they say a lot - I am just happy at Everton and focusing on them."
Source: PA
Source: PA