Based on current rumors, that Joselu is interested by the Qatar team and the team is Al-Gharafa, I personally don't know about the Qatar league and whether the Al-Gharafa team is the top team there or not. Because I think, it is quite strange if Joselu accepts an offer to play in the Qatar league, because it looks like Joselu can still play in Serie A which is usually still actively playing old players. But, it also seems that if Joselu leaves, then playing in the Saudi Pro League is also a good choice, because of course it will get a higher pay too and it is good to end his career by getting a lot of money in the Saudi Pro League.
It was confirmed because in an interview it was explained that Madrid made the player permanent but a day later he was immediately transferred to Qatar for the same price although with a slightly larger salary because he is said to receive a salary of 7 million euros per season while in the Qatar league because he is not young so it is a fair price.