Spanish right-back Bellerin suffered a concussion after being caught in the head by Alonso's elbow as the pair jumped for a header, which resulted in Chelsea’s opening goal of their 3-1 win.
Chelsea’s Alonso was not adjudged to have committed a foul but Bellerin was forced to come off after treatment.
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?
But the Arsenal defender was able to return against Hull yesterday and played the full 90 minutes in the 2-0 win.
And speaking before Bellerin's appearance yesterday, Alonso revealed he spoke to his compatriot via text.
He told Sky Sports: "I spoke to him at half-time and after the game the following day, I texted to see how he was.
Marcos Alonso challenges Hector Bellerin
"I think it was an unlucky challenge, we were both going for the ball.
"I never meant to hurt him and I hope he can play very soon.
Get Quotes on Home Insurance
"I asked him what happened when he fell to the ground and he told me he couldn't remember so I think it was just unlucky and I hope he gets better soon."