Coquelin takes shirt off Messi's back but referee didn't give a foul

Francis Coquelin pulled Barcelona forward Lionel Messi's shirt right off in a bizarre incident during the Copa del Rey clash at the Mestalla.

It came in the 37th minute shortly after the Argentine received a knock following a collission with Valencia goalkeeper Jaume.

Strangely, referee Undiano Mallenco, did not even signal a foul.