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Alonso netted the opening goal in Chelsea’s 3-1 win over Arsenal after out-jumping Bellerin and heading in.
Replays showed the Chelsea defender appeared to catch the right-back with his arm.
Arsene Wenger confirmed after the game that Bellerin was concussed after suffering the blow to his head.
— Marcos Alonso (@marcosalonso03) February 5, 2017
Alonso has sent his best wishes to the blow – but says he did nothing wrong.
“I jumped a bit higher and got to the ball first,” he said.
“I didn’t even see him coming so I don’t think it’s a free-kick.
The left-back added: “I feel sorry for him.
“He’s a good friend but I didn’t see him.
“I hope he’s okay.”