The Gunners are prioritising Gyokeres' signing after going cold on RB Leipzig's Benjamin Sesko.
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The Mirror says Berta flew into Lisbon yesterday for face-to-face talks with Sporting directors and to thrash out a fee for the Swede.
It's been suggested Berta will aim to settle on a fee rising to £70m with Sporting.
Gyokeres agreed a deal with Arsenal some weeks ago over terms worth £200,000-a-week. With Sporting last season, the centre-forward scored a massive 54 goals.
