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In my opinion, Gyökeres would be more successful at Arsenal than Sesko. The Swedish striker is also physically strong. He seems to have found his groove recently and knows how to play very well. He's also had some successful performances for the national team, so I'm in favor of him. However, the real question is whether the transfer fee he's asking is truly something Arsenal can afford. I don't know if Arsenal can afford such a high transfer fee. If they can acquire him, I think the team will move up. Of course, he scored 39 goals in the Portuguese league, and even 20 in the Premier League would be enough for Arsenal.
Viktor Gyökeres seems better especially when comparing total cost of both players, Gyökeres is a good buy for the money. Now they will hope he can replicate same form he had at Sporting utilising chances wasted in past seasons.
This money will be used to strengthen their squad especially against injury woes similarly to what they experienced last season and also from the fact that some players are no longer on the team, therefore needs to be replaced.