Viktor Gyokeres averaged more than a goal per game last season for Sporting
Viktor Gyokeres says he decided to sign for Arsenal after the Gunners thrashed his Sporting side 5-1 in the Champions League last season.
The 27-year-old Sweden striker has joined Arsenal for 73m euros (£63m) on a five-year contract.
The move was held up because of negotiations between the clubs over add-on payments, with the final sum made up of a 63m euro transfer fee plus 10m euros in add-ons.
Gyokeres was in the Sporting side dismantled by Mikel Arteta's team in the group stage of Europe's top competition in November.
