It's been reported that after the expiration of his current loan deal with AS Roma, he's going to join a Saudi Arabian club since his services are surplus to requirements at his parent club Chelsea. Lukaku is more of a physical striker than a tactical striker and I think that's gonna help him to have a successful spell with any Saudi Arabian team he decides to join. Chelsea will also be happy to see him leave the club to join a club that they'll definitely get a good financial reward from so the Saudi Pro League is definitely gonna be the best destination of Lukaku next summer
I agree with you that in fact Lukaku is a physical striker and is very suitable if he joins the Saudi Arabian team and of course with his big physique he is able to easily break through the opponent's defense because with his big physique the defenders will definitely have difficulty blocking him. 
I haven't been following this news but can you tell me which team will sign Lukaku?