MLB.com, Baseball America, and Baseball Prospectus all consider Rosario the team's top prospect.
Rosario, who spent 2016 between High-A St. Lucie and Double-A Binghamton, hit a combined .324 with 42 extra base hits in 120 games.
To get reliever David Robertson from the White Sox, the Mets would have to include Michael Conforto in the deal, team sources told Daily News reporter Kristie Ackert.