Ronaldo has been out with an ankle injury that he suffered in the goalless draw against Real Mallorca on 29th August.
“I feel better and we’ll see how it (the injury) develops,” he told reporters.
“I’m still not perfect but almost at one hundred per cent. I’ll return as soon as possible, maybe in two days I can rejoin the squad.”
He added: “I believe I can be ready for the match against Ajax.”