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Goncalo Guedes scored two goals in front of Arsenal scouts last week as the Gunners step up their pursuit of the Benfica star.
Arsenal sent representatives to watch the Cup game between Benfica and Guimaraes as the Portuguese giants ran out 2-0 winners in the Cup.
Guedes has a £52 million release clause in his contract with reports claiming Benfica have already rejected a £25 million offer for his services from Valencia.
The result came via two quick goals from Guedes just before half-time with the attacker grabbing his sixth and seventh goals of the season.
The London Evening Standard claim Guedes netted the goals in front of Arsenal scouts after the club were assured a deal to bring the youngster to Paris Saint-Germaine were false rumours.
There were suggestions PSG had sealed the deal for the 20-year-old, but Arsenal have been given fresh hope in their pursuit after Benfica insisted he was still on the market.
Guedes has been a key member of the Benfica side this season with the youngster sitting out just three games this campaign.
The forward can play upfront, but often plays just behind the main striker.