The former Blaugrana star, who became the most expensive player in the world when he moved to Paris Saint-Germain in August, has been tipped to join Los Blancos in the near future.
Andres Iniesta does not believe Neymar will return to Barcelona.
Alisson has been linked with Real Madrid and Liverpool.
Neymar has amassed 19 goals and 13 assists in just 20 league games for the Parisian club, and yet the season as a whole will be deemed a failure given PSG's inability to reach the latter stages of Europe's premier club competition.
"It would be hard for a player to return to a former club", Iniesta told El Larguero.
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"I think it'll be hard for him to leave PSG, though, because they spent a lot of money on signing him".
Real Madrid forward Marco Asensio has lauded Neymar amid growing speculation linking him with a move to the 12-time European champions.
"It would surprise me more if he returned here than that (to join Real Madrid), but we will need to see what happens in the future".
Ceballos's club teammate, Dani Carvajal previously summed up the youngsters frustrations following a series of cameo appearances as he said, via the Express: "There are 24 players in the squad and we all want to play".
Neymar is expected to be sidelined for three months due to his foot injury and return to action in time for the start of the World Cup in Russian Federation.
Boss Unai Emery is expected to leave at the end of the season, with the hunt for a new manager ongoing.