Ronaldo was a dejected figure after United's Premier League title hopes took another huge dent.
The Red Devils were smashed 4-2 at the Foxes, leaving them lying down in fifth, five points off leaders Chelsea.
According to reports, Ronaldo was fuming at the full-time whistle and went to go straight back to the dressing room.
However, he was stopped by Ole Gunnar Solskjaer who pointed to the away supporters.
Ronaldo is believed to have turned and clapped them for making the 100-mile journey, reports The Sun.
United's loss saw the end of a staggering 29 unbeaten away spell, a Premier League record.
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