Former Premier League referee Graham Poll insists Manchester United midfielder Casemiro has failed to "adapt" his approach following his second sending-off of the season.
The Brazilian international, who joined United in a big-money deal from Spanish giants Real Madrid last summer, was dismissed during the first half of Sunday's goalless draw with Southampton at Old Trafford.
After initially being shown a yellow card for a hefty challenge on Saints midfielder Carlos Alcaraz, VAR ordered on-field referee Anthony Taylor to review the decision on the pitchside monitor.
Taylor then made the decision to brandish a red card in the United midfielder's direction, sending him for an early bath for the second time in his last three Premier League appearances.
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