None. USC is not an NFL team. Perhaps you should be asking how many FORMER USC players are in the NFL. The answer to that would be... um... a lot. reggie bush, Carson palmer, mark sanchez, clay matthews(i think)...
The USC Trojans
Michigan - 39 USC - 28 This as of 9/20/07
The University of Southern California Trojans has one of the most recognizable college football teams in the country. There are currently 53 former USC players in the NFL.
USC leads the all time series 5-2-1 with 1 game vacated. 1) 1963 - Oklahoma 17, USC 12 2) 1964 - USC 40, Oklahoma 14 3) 1971 - Oklahoma 33, USC 20 4) 1973 - USC 7, Oklahoma 7 5) 1981 - USC 28, Oklahoma 24 6) 1982 - USC 12, Oklahoma 0 7) 1988 - USC 23, Oklahoma 7 8) 1992 - USC 20, Oklahoma 10 9) 2005 - USC 55, Oklahoma 19 (Orange Bowl) - this win was vacated by USC after they were found to have used ineligible players during the 2004 season.
1. Reggie Bush
Currently, the University of Southern California (commonly known as USC) has the most football players currently in the NFL, with 38 total players in the game.
USC, Texas, Florida
As of 7/9/2012 the Seattle Seahawks have 6 former USC players on their roster. If you check on USC's official website, (http://www.usctrojans.com/sports/m-footbl/trojans-in-the-nfl.html) it shows the number of active former USC players currently in the NFL. However, this website doesn't update very often. I just looked at it, and noticed that they have players from the 2011 season still listed on teams that they no longer play for.
Usc, texas, notre dame, Ohio state, Michigan, Florida, Florida state, Oklahoma, Nebraska, Penn state
As of 2010 Notre Dame had 462 players drafted. USC (Southern California) was second with 461 drafted players
The University of Southern California has had more NFL Hall of Fame inductees than any of college. There have been eleven inductees from USC to date.
Through the 2008 season, that is Notre Dame with 496 players that have been on an NFL roster for at least one game. Second is USC at 417.
Matt Leinart is with the Cardinals,Reggie Bush is with the Saints,And Carson Palmer is on the Bengals.