Neymar left Barcelona past year to join Paris Saint-Germain in a world-record £200m deal and has been tipped to return to Spain to sign for Madrid this summer.
"Position by position, Madrid have the best players in the world", Messi told TyC Sports.
Messi, 30, was rested by manager Ernesto Valverde as Barcelona were downed 5-4 by Levante on Sunday to end their hopes of going the whole La Liga season unbeaten. "It would make Real Madrid even stronger from a football point of view".
And he then appeared to take a little shot at Neymar, without specifically naming him, when talking about being at Barcelona and leaving.
"I compete to improve myself year after year, to surpass what I have done before".
"I'm not tempted to leave Barca", Messi told TyCSports.
This summer Salah has another opportunity to demonstrate his talent on the big stage as he represents Egypt at the World Cup.
The attacking duo have shared the Ballon d'Or between them since 2008, winning five each, and are widely considered to be the greatest footballers of their generation.
"I want to win the Champions League every year, to be a league champion every year". I will not be better anywhere else, this is the best team in the world.
While both the players have been phenomenal and are playing in the same era, in the same league and are also rivals - Barcelona vs Real Madrid - but still there is no exact scale or criteria where one can judge the victor. If it happens that I play with Kun it will be because he comes to me.
The Brazilian has enjoyed a decent amount of success in his first season at PSG-although they also disappointed in the Champions League-but he has already been linked with a return to Spain. "We want to overcome that barrier", he said.