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If I were Pogba if there is no offer, I would play for any club for free. What he needs to do now is to assure clubs that he can still play top-class football. By playing free for a club, he would showcase his skills, which will attract clubs that will be willing to pay for his services. He is just like a new product that needs advertisement to convince customers to buy it.
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He doesn't have to play for free, but he has to lower his criteria and expectations. Clubs at the level of Marseille could be ideal for him, but he may have to make some concessions in terms of annual salary. Probably in the last years of his career. After a season of trying himself at a Marseille level club, he could make a transfer outside Europe to earn more money...