Arsenal boss Arsene Wenger was less than happy at how the blow to his right-back was ignored by the officials yesterday.
Chelsea's 13th-minute opener in their 3-1 triumph came at a cost for the Gunners as Bellerin was forced off.
Gabriel replaced him in the backline but Antonio Conte's side proved to strong as they went on to effectively end Arsenal's title hopes.
Bellerin only came back into the first XI at Chelsea after being on the bench against Watford in midweek, having sat out most of January.
Arsenal's Hector Bellerin couldn't continue against Chelsea after his blow
Should Chelsea's goal have stood after this challenge on Hector Bellerin?
Sat, February 4, 2017
Should have Chelsea's opening goal against Arsenal stood after this challenge on Hector Bellerin
1 of 10
Should Chelsea's goal have stood after Alonso's challenge on Bellerin?
He didn’t know the score at the time. He didn’t see the goal
And Arsenal will now hope he can recover in time to face Hull on Saturday (12.30pm) at the Emirates.
"Bellerin was concussed," Wenger said.
“Not completely knocked out. He didn’t know the score at the time. He didn’t see the goal."
Wenger insisted it was "100 per cent a foul" on his defender by Alonso, who jumped higher but caught Bellerin with an elbow in the process of heading into the Gunners' unguarded net.
Chelsea's Marcos Alonso caught Hector Bellerin heavy in the process of scoring
Arsenal manager Arsene Wenger wants to see change from officials when it comes to aerial challenges
The Arsenal boss also claimed referees are taking too much of a lenient attitude with aerial challenges to those on the floor, believing change is required.
He added: “One of the peculiarities of the game today is that referees are much more severe with tackles on the ground and let much more go with elbows in the face.
“It’s not only today, but in many, many games I see that. But it’s more dangerous to hit the head than the legs.”