"We haven't heard anything and he's one I'd like to keep hold of," Warnock told the Croydon Advertiser.
"His contract is up at the end of the season and that's what has probably triggered these reports."
Wayne Rooney has returned to Everton after 13 years at Manchester United.
Germany defender Antonio Rudiger has joined Chelsea from Roma on a five-year contract.
Wayne Rooney has returned to Everton after a record-breaking career at Manchester United.