The two have an ongoing battle on the training ground to see who is the better finisher.
But asked in an Instagram Q&A who was the better in front of goal, Oxlade-Chamberlain said: "I'd really like to say me. And I'm still backing myself. But in shooting sessions he beats me all the time.
"We always have a competition in training and I don't know why but he always beats me.
"It's doing my head in. He's got a strike on him."
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