Neymar left the LaLiga champions for Parc des Princes in a world-record €222m move back in August 2017 in a bid to pursue his dream of winning the Ballon d'Or.
The Brazil international was said to have cited a move to France as the best way to step out the shadow of Messi's phenomenal displays and embark on a new project in France - in a bid to bring European glory to the Qatari owned side.
However, reports have been rife that the 26-year-old now feels a return to Spain would best suit his career, with the Blaugrana and rivals Real Madrid touted to make approaches at the end of the season.
"I see it as complicated," Messi told Spanish publication Marca.
"We would love him to come back for what he means, both as a player and for the locker room.
"We are friends, we have lived very nice moments, others not so much, but we have spent a lot of time together.
"However, I find it very difficult [for him] to even leave Paris," he added. "PSG are not going to let Neymar get taken away."