The Blue Jays have designated Juan Rivera for assignment and will recall Travis Snider for tomorrow's game, tweets MLB.com's Gregor Chisolm.
Rivera, 32, came to the Jays in the trade that sent Vernon Wells to the Angels back in January. In 271 plate appearances in Toronto, Rivera hit just .246/.310/.365 with six homers. He split his time fairly evenly between left field, first base, and designated hitter, though he did make a handful of appearances in right field as well.
Many were surprised to see the Jays demote Snider, a long-time top prospect who played well when he was healthy in 2010, after just 99 plate appearances this season. Snider hit just .184/.276/.264 but showed significant improvement in the minors, hitting .333/.403/.488 in 226 plate appearances. Snider was rated as the game's sixth-best prospect prior to the 2009 season, and is still just 23 years old despite having 208 Major League games under his belt.