Neymar's problem won't be on field performances but his entourage. It's becoming a huge hassle as Neymar's dad and the likes of Wagner Ribeiro who is constantly running his mouth on how Real's offer was better for Neymar in a financial sense but Neymar turned it down to play with Messi. He comes off as a bitter Madridista that has a raging hard on to trying and take Neymar to Real.
Neymar's dad is always trying to find ways to milk his own son for huge amounts of money, these PSG/EPL rumors will never go away as long as Neymar is here. Neymar has the final word on everything but his inability to reign in the likes of his dad and others in his entourage will hinder him no matter where he goes.
Neymar is a grown man now and no longer a teenager, He needs to reign in those fools behind the scenes.