"They both worked incredibly hard on the pitch, but Cristiano took it up a level," he said.
"Off the field, Ronaldo was also focusing on everything extensively, such as resting up properly and strengthening his body.
"After training sessions he would often work on his free-kicks and then come to me and say: "Edwin, can you go in goal?"
"I'd say I was old so he would be better off using one of the youth-team keepers, but he would insist I went in goal as he wanted to score past me.
"I would tease him a lot and say things like: "You won't score against me, Ronnie, you know it. Ask the reserve goalie, that's better for your confidence.
"He'd get agitated and reply: "No, no. You've got to go in goal!"