Per the milb Venezuelan Summer League transactions page, three players have been assigned to the VSL Rays roster: catcher Gianfranco Aldazoro and pitchers Brohiglyn Rivero and Johan Marval.
Aldazoro, who will turn 17 in April, is a 6'1" 205 lb. righthanded hitter from La Victoria, Venezuela. He batted .213/.288/.298 in 47 ABs for the Rays team in the Liga Paralela last fall/winter.
Rivero is a 6'3" 185 lb. righthander from Puerto Cabello, Venezuela. He turns 18 in May. Rivero started one game in the Liga Paralela, only lasting 1.0 IP and allowing 1 earned run on a hit and 3 walks with a strikeout.
Marval, who won't be 18 until November, is another righthander out of Valencia, Venezuela. He is listed at 6'1" 195 lbs. Marval also pitched in the Liga Paralela, putting up a 6.41 ERA in 10 relief appearances. Over 19.2 innings he allowed 29 hits (including 5 homeruns) and 12 walks while striking out 15 batters.
[Update]: Make that four, as pitcher Kevin Cazorla has also been added to the VSL Rays roster. A 6'2" 190 lb. righthander from La Victoria, Venezuela, Cazorla will turn 18 next October. In the Liga Paralela he had an 8.59 ERA in 5 relief appearances. Over a total of 7.1 IP he allowed 12 hits, 9 walks, and struck out 3.