Arsenal's red card blues continue with Per Mertesacker dismissal against Chelsea
Per Mertesacker on Sunday became the fourth Arsenal player to be sent off in the last five Premier League games with Chelsea. The German was last man when he was adjudged to have tripped Diego Costa in the 18th minute. Here Press Association Sport looks at the Gunners' other recent dismissals in derby clashes with the Blues.
KIERAN GIBBS (Chelsea 6 Arsenal 0, Stamford Bridge, March 22, 2014)
There was a case of mistaken identity in Arsene Wenger's 1,000th game in charge as Gibbs, rather than Alex Oxlade-Chamberlain was sent off for handling the ball in the box. Referee Andre Marriner admitted his mistake and neither player served a suspension.
GABRIEL (Chelsea 2 Arsenal 0, Stamford Bridge, September 19, 2015)
A running feud with Costa saw Gabriel retaliate with a petulant kick and get dismissed. Costa might have seen red himself after catching Laurent Koscielny with a flailing arm and chest-butting the Frenchman before Gabriel naively intervened. Costa was retrospectively banned for the incident with Koscielny.
SANTI CAZORLA (Chelsea 2 Arsenal 0, Stamford Bridge, September 19, 2015)
The Spain playmaker was booked in either half by referee Mike Dean as the Gunners finished the game with nine players. Cazorla's second yellow card came for a trip on former Arsenal captain Cesc Fabregas as Chelsea claimed a first home win of the season.