Royston Drenthe, 38, who was on loan with Everton in 2011-12, has suffered a stroke and was rushed to hospital.
A statement from his current team FC De Rebellen, a team of veterans in the Netherlands, said: “Last Friday, Royston Drenthe suffered a stroke.
“Drenthe is currently being taken good care of and is in good hands. The team and those involved are hoping for a smooth recovery.
“Royston’s family is asking for peace and privacy during this period so they can provide him with the support and space he needs for his recovery.”
His season-long loan at Everton was due to expire at the end of June 2012 and was not converted into a permanent contract, despite the obvious skill and flair he could bring to the team.