Smalling during his side’s away match against Arsenal at Emirates Stadium.
The incident happened shortly after Pierre-Emerick Aubameyang had converted a 69th-minute penalty to give the Gunners a 2-0 lead against United.
After pushing Smalling, the man ran with his arms aloft towards the Gunners players celebrating their goal.
Smalling was not hurt and Arsenal stewards took the man off the pitch.
It came only hours after Aston Villa midfielder Jack Grealish was punched in the face by a spectator during Villa’s 1-0 derby win over Birmingham City at St Andrew’s.
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