The Sporting CP striker is waitng to complete his move to the Gunners.
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Last season, Gyokeres and Gabriel exchanged barbs as they both celebrate goals in similar fashion.
But Gabriel told BBC Sport: "We all know he is a great player, but he is a Sporting player not an Arsenal player.
"Playing against him last year was a challenge. He is great and had a great season. About the celebration, it is something I can't talk about right now."