Rosell, speaking with Radio Marca, also urged Barca to re-sign the Brazilian.
Neymar was sold to Paris Saint Germain in 2017 for a world record €222million fee.
However, he has been linked with a return to Camp Nou and Rosell believes the LaLiga giants should do all they can to bring him back.
“If I were the president of Barca, I would try to sign Neymar.
“He is the second-best player in the world after Messi and fits perfectly into the philosophy of the club,” he said.