Long has taken the teenager under his wing and reckons his fellow speedster will prove a big success in the Premier League.
“Mike is an exceptional talent - he's ridiculously quick with that goalscorer's instinct as well," said Long.
“I would say he's maybe a little quicker than me, I'll have to admit that! He's really sharp off the spot.
“I'm more of a long-distance sprinter but off the spot he's rapid.
“Maybe he looks quicker because his legs move faster but he's got that sharpness from a standing start that Sadio Mane has.
“But I would say Mike's quicker than Mane, he's the fastest I've played with at the club.
“It takes your breath away how fast he moves past players. Moussa [Djenepo], Sofiane [Boufal] and Nathan [Redmond] all have it as well."
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