Craig Butler says Bailey can still develop further.
"There is still a lot to take off. I don't think Leon has reached 40 percent of his potential yet," the agent told the Up The Villa Podcast.
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"You have only seen 40 percent of what Leon can do. It's all about timing, I think one day he will be the best player in the world."
Butler also said: "He will continue to get better and better. (Lionel) Messi is getting older, Cristiano (Ronaldo) is getting older, Neymar has injury problems and is getting older, the same with (Kylian) Mbapp. There is no ceiling to Leon's potential. You haven't seen anything yet."