Do you lot think he can challenge Haaland as premier leagues best striker?
Isak just outscored Haaland (by a goal) to be the top #9 for the season. Granted Haaland has had injuries and missed some games, but at the moment, it's not clear who is the top dog between those two.
If Gyokeres is in a team that supplies him as much as Haaland is accustomed to, I think he can hit 20 PL goals, but I don't think he's better than the Norwegian, and Isak is a better player and capable in a lot more scenarios. More importantly, we know what these two look like against low blocks, PL defenders and probably even more importantly, PL keepers.
If you watch his goal compilation vid above, a good number of those goals don't happen in the PL, plus he is not going to be some athletic freak here where he looks like a man against boys in Portugal, so he's going to have to use more guile and craft to make opportunities for himself. Can he carryover 1:1 as is? I don't think so, but that's speaking about pure theory and hypothetical as we simply don't know if this guy will find low blocks and less space little to no problem.
Until we find out just how special this guy is or is not, it's common sense to lean toward it being doubtful he can outright usurp these two. Still, some players come to the PL and go up a level, others get swallowed up by it - I doubt he will remain the same, and if I were to bet about better or worse, common sense would tell me worse is more likely than better. 15-20 goals would be an excellent return.
We should note that Haaland is a £150m-£200m player and Isak would be expected to fetch £100m-£150m, so it's not the same ballpark as a £60m-£70m Gyokeres until he proves otherwise. It's only the likes of Mbappe, Kane and Lewandowski that would be expected to come to the PL as they are and outdo what's here or be in contention as the top #9.