Clarke collapsed during a match while on loan at Leicester last month.
Keane spoke to the 27-year-old earlier this week and is confident he could play again once his recovery is complete.
He said: "Football is not that important when a player comes close to dying.
"Clive's health is the most important thing and we will support him whatever he decides to do.
"But we are also hopeful he can continue to be a professional footballer, why not?"