Arsenal need to take action ASAP, otherwise other top teams will sign Gyokeres. It's not impossible if Manchester United, Liverpool, Barcelona, Milan, or other teams that currently have old/not reliable strikers to recruit him because he's really promising.
If he moved to Liverpool, Arsenal lose two thing, one is Gyokeres and another one is they will face Liverpool with better strength.
Viktor Gyokeres is a very impressive striker that Sweden and Sporting Lisbon have and i believe Mikel Arteta is not gonna allow the player to skip his targets because he will fit in well as an Arsenal striker and considering the fact that Arsenal is looking forward to a premier league title means they need more strikers. I don't think Liverpool is very upfront in signing the player so hopefully Arteta can still succeed in signing the striker regardless that he is costly because for Arsenal to ignite their title hopes they need to pay huge sacrifices and signing more quality players to the team is the only way they can achieve that.