The Wales international has been superb since the back end of last season and scored in a man-of-the-match display against Fenerbahce on Wednesday night.
"Apart from scoring the second goal, he gave the ball to Theo for the first and he then set up Gibbsy. Aaron is bossing the midfield, his engine is massive so he can run and run and tactically he has improved a lot.
"He had a bad time with injury but now you can see that physically he is stronger. Maybe that physical presence gives you more confidence with challenges and then comes the technical aspect of football and he always had that quality.
"He has improved massively in recent times."
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