Rob Gronkowski could be catching passes from Tom Brady in a REAL game this season … so says Jay Glazer, who tells TMZ Sports he thinks the TE could definitely unretire this year!!!

"Could he possibly come out of retirement for a last little playoff push? Why not?!" Glazer says … "Why wouldn't he?!"

Of course, Gronk is currently enjoying the retired life … he's been partying up with his swimsuit model GF, Camille Kostek, and traveling all over the world dancing his face off.