Arsenal manager Arsene Wenger has sent one of his scouts to monitor Sporting Lisbon striker Islam Slimani.
The Algeria international was in action against Pacos Ferreira last Saturday and according to Record, an Arsenal scout was spotted at the Estadio da Mata Real.
West Bromwich Albion are also interested in the 28-year-old according to reports in England.
Arsenal manager Arsene Wenger confirmed at the end of last week that he is working hard to find new players before the end of the summer transfer window.
"It doesn't cost a lot of money, that," he told reporters.
"Why do you say I'm reluctant, I don't understand that? If I buy you tomorrow for £45m that means I've bought you for £45m, have I done well? Yes, if I listen to you, I will have done well because I spent the money. That is not a quality, buying a top player, that is different - and we are ready to do that.
"I spend £300m if I find the player and if I have the £300m. Not to forget as well that we are a club who has 600 employees who we need to have a responsible attitude for as well.
"It's a bit surprising that you come out of football games and you don't speak about football, you have to speak about money.
"I believe that you have to respect the players who play, the performance that has been done today by those teams and if you find players who can strengthen our team, then we are not reluctant to spend the money."