Sporting seems to kill Gyokeres' career to develop, they set a very high price that is not commensurate with Gyokeres' quality so it is natural that no team is interested in bringing in Gyokeres.
Actually there is no proof that Gyokeres because he did not play at the highest level of European competition even though he is 27 years old which is considered the peak of a football player's career but Sporting should have set a reasonable price to be negotiable.
That's not true mate, Gyokores is one of the best strikers out there, dude scored up to 80 goals last season alone and even scored more than 30 the previous season and you think he's not good enough? The price that Sporting set is worth the quality if Frankfurt would be asking for €80m plus for Hugo you think Sporting shouldn't ask for more concerning Gyokores? What caused the conflict between Gyokores agent and Sporting is that they had an agreement last season that he could leave to another European club for a fair amount but Sporting refused to stand on their words in thus transfer after he scored 80 goals, according to them a player with such ability should be worth more and it true but then I deal is a deal and they need to keep to their words.
Yes from what you said is true, he is a killing machine in the opponent's penalty box area and his goal record is almost touching 100 goals while defending Sporting CP but with that achievement will Gyokeres be guaranteed to be able to do the same thing in a different league? plus Gyokeres has not been tested enough at a higher level, maybe this is the reason Man Utd and Arsenal who want to get his signature have to think twice about redeeming the player at the price offered by Sporting. There is always drama in every transfer market just like the Osimhen drama in the transfer market last season. By the way I heard that Juventus are also interested I hope Juve are really serious this time.