"I don't understand why there's so much concern about it," Nicol told the talkSPORT.
"This guy is so important for Belgium. Look at the squad and the team they have and this guy is such a huge part of it. Why can't he walk into Manchester United and be such an important part of them as well?
"We know he can score goals, we know he can play up forward. But in the middle of the park we underestimate how good he is on the ball, he doesn't give the ball away.
"I think at Everton people just underestimated a good player he is."
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