The Brazil midfielder says to his compatriot that he'll always have a place open at his former club's biggest rival.
Real Madrid midfielder Casemiro hopes Neymar joins the La Liga champions and he said Neymar would always be welcome at the club.
Neymar, 25, has been linked to Madrid despite only joining Paris Saint-Germain from Barcelona in a world-record deal in August.
Casemiro said he would happily have Neymar at the Santiago Bernabeu, but insisted his international team-mate was happy in Paris.
"He's a star. He knows what he's doing. He's a great player and he'll always be welcome at Real Madrid," he told COPE after Brazil's 0-0 friendly draw with England on Tuesday.
"I hope he comes, but he's happy at his club."
Brazil's draw against England completed a fine year for Tite's men, who dominated CONMEBOL qualifying to reach the World Cup.
Casemiro said Brazil had an opportunity at Russia 2018, but acknowledged his nation would be targeted.
"We know that in a World Cup, everyone wants to beat Brazil," he said.
"But we have a great group."