The incident occurred after just six minutes of the fifth-round tie when Mateta raced after a long ball forward and was clattered full-on by Roberts who had rushed out of his goal to clear.
Daniel Munoz is doing something super fun and super different at Crystal Palace
Read MoreInitially, referee Michael Oliver failed to produce a red card, but he soon changed his mind after being sent to review the incident on the pitchside monitor.
The 27-year-old appeared to give a thumbs up in the direction of the Palace dugout as he was carried down the tunnel.
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