And ex-United and Forest midfielder Keane piled praise on Garner ahead of a potential return to Old Trafford this summer.
Speaking on ITV, Keane said: "He's been [in] a really good partnership with [Ryan] Yatesy, they complement each other very well.
"He's technically very good. He likes to dictate the play, sits a little bit deeper than Yates.
"Tough game for him today, this is a great experience for young players coming up against top players like Liverpool.
"It's a great way to learn."
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