Harry Maguire on his side had given the hosts the lead at Old Trafford with a powerful header.
However, many fans still reckon Onana did not do anything special as he was merely doing his job by saving what was a poor penalty.
England defender Harry Maguire, 30, has threatened to leave Manchester United if he continues to struggle for regular first-team football under manager Erik ten Hag.
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Southgate has tipped Harry Maguire to earn more minutes at Manchester United in the coming weeks despite a mixed display against Ukraine on Saturday.
