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The News & Observer, Ethan Hyman, File) MANDATORY CREDIT, Associated Press
FILE - In this Jan. 4, 2012, file photo, N.C. State's Alex Johnson (3) looks to pass around Delaware State's Kendall Gray (1) during the first half of an NCAA college basketball game, in Raleigh, N.C. Johnson, who graduated from CS-Bakersfield with a degree in communications, played three seasons there. He is one of 15 Division I players that are playing under the NCAA’s rule allowing graduates to transfer and play their final season without sitting out.

RALEIGH, N.C. — There's a free agent trend quietly developing around college basketball and coaches are trying to figure out how to get a handle on it.

Graduate transfers can transfer and play immediately at a new school by enrolling in a graduate program unavailable at their former school.

Fifteen players have played right away as graduate transfers this year, according to STATS LLC. The programs range from BCS schools like Illinois and North Carolina State to smaller programs like Houston Baptist and Texas Southern.

Michigan State coach Tom Izzo has one in starting guard Brandon Wood from Valparaiso, but he's also worried that the rule could lead to "a national problem" with attempts to recruit players already on campuses.