It can be a bit of a shock, he seemed to be concussed, he would have been seeing stars for sure
Martin Keown on Man Utd star Romelu Lukaku
Being a former defender, Keown knows how it feels to be hit on the head and was sympathetic towards the Manchester United frontman.
“Yeah (it looks innocuous) but if you’ve ever been really clouted in the back of the head then you’ll know all about that," Keown said.
"It can be a bit of a shock, he seemed to be concussed, he would have been seeing stars for sure.
"You just can’t take any risk with that nowadays.
Mourinho explains why Lukaku didn't celebrate West Brom goal
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Romelu Lukaku was given oxygen before being carried off in Man United's game with Southampton
"We’ve heard some horrendous stories about the long-term effects.
"It’s best now that he rests up for a number of days.
"He’s got all the officials around him making sure that will happen."
The game ended 0-0 at Old Trafford, leaving United third in the table, 14 points behind Manchester City.