"I didn't expect it," Henderson told the Liverpool Echo.
"I have just tried to focus on my game and not really thought about it.
"I have a lot of respect for him, he's an unbelievable figure in football, but hopefully he isn't right and I won't have too many problems later in my career.
"It was quite unusual but I haven't read the whole thing. I know he's spoken about my running technique and I'll have to read it properly at some point. It doesn't bother me too much."
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