The full-back was clattered in a collision with Marcos Alonso at Stamford Bridge and his manager says he had no other option but to take him off
Arsene Wenger says a concussed Hector Bellerin had no idea Chelsea took a 13th-minute lead in the Premier League leaders' 3-1 win over Arsenal.
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Gunners boss Wenger felt Marcos Alonso's aerial challenge on Bellerin constituted dangerous play as the wing-back arrived at pace and caught the Spain international with his arm as he headed home.
Bellerin made way on medical advice shortly afterwards and second-half goals from Eden Hazard and Cesc Fabregas effectively ended Arsenal's title ambitions.