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.
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"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."