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11/20/09 2:55 PM ET

White Sox add five to 40-man roster

Prospects shielded from next month's Rule 5 Draft

On Friday, the deadline for clubs to protect prospects from next month's Rule 5 Draft, the White Sox added five players to their 40-man roster.

Chicago added outfielder Stefan Gartrell and right-handed pitchers Brandon Hynick, Santo Luis, Brian Omogrosso and Sergio Santos. The South Siders now have 37 players on their 40-man roster.

If a non-protected player is selected in the Major League portion of the Draft on Dec. 10 in Indianapolis, he must stick with the Major League club that claims him -- either on the active roster or disabled list -- for the length of the 2010 season or else be offered back to the White Sox for $25,000, half the fee for selecting such a player.

Of the players the Sox protected, the most notable addition to the roster is Santos. A first-round pick by Arizona in the 2002 First-Year Player Draft, Santos spent his first seven Minor League seasons as a shortstop before being converted into a pitcher prior to the 2009 season. Santos, 26, went 0-3 with an 8.16 ERA in 26 relief appearances between Class A Kannapolis, Class A Winston-Salem, Double-A Birmingham and Triple-A Charlotte.

Santos' numbers might not stand out, but he's touched 97 mph while pitching in the Arizona Fall League over the past month and has shown improvement

"Sergio has a plus arm, and he's someone who is drawing attention out there," said Kirk Champion, the White Sox Minor League pitching coordinator.

Champion also said Santos' slider is around the plate more than when he first transitioned and he has an outstanding changeup.

Gartrell, 25, led the White Sox Minor Leaguers in RBIs last season with 89 and was second in home runs (23) while batting .281 in 132 games between Birmingham and Charlotte. Gartrell was a 31st-round selection in the 2006 Draft.

The White Sox acquired Hynick, 24, from the Rockies on Aug. 31 in exchange for pitcher Jose Contreras. Hynick went 11-9 with a 3.72 ERA in 27 combined starts with Triple-A Colorado Springs and Charlotte. He made just one start for Charlotte following the trade, allowing one run on four hits over seven innings. An eighth-round pick of the Rockies in the 2006 Draft, Hynick has gone 41-24 with a 3.25 ERA in four Minor League seasons.

Omogrosso, 25, spent most of the 2009 season with Birmingham. He went 7-2 with a 4.19 ERA and 64 strikeouts in 13 starts before being promoted to Charlotte. The fifth-round selection in the 2006 Draft made four relief appearances for the Knights following his promotion.

Luis went 5-4 with a 4.34 ERA and 14 saves in 47 relief appearances at Winston-Salem in 2009. He struck out 79 over 56 innings, averaging 12.7 strikeouts per nine innings pitched. The 25-year-old was selected from Houston in the 2007 Rule 5 Draft.

Kelly Thesier is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.