He was lucky not to be given a red card, says ex-England boss
The 25-year-old elbowed the young Latics midfielder, but referee Mark Clattenburg chose only to award a free-kick.
It had been initially thought that the FA might step in to take retrospective action against the former Everton hitman, prompting suggestions that he could receive a three-match ban.
However, the authorities chose not to follow up with a punishment, which has since prompted criticism from many quarters.
"You keep thinking Wayne Rooney is going to get better at things like that and then he goes and does something like that," Keegan said, according to The Mirror.
"He’s still young and he’s still learning.
"He was lucky. To be fair to Wayne Rooney, and I always try and look at both angles, the lad was trying to foul him.
"He was running across him to come out and stop him, but that doesn’t give him any excuse to do what he did."