Hamilton, playing for Class-A Hudson Valley, will have the knee examined next week by Dr. James Andrews.
On the restricted list the last two seasons, Hamilton received permission from Major League Baseball on June 30 to play in minor league games the rest of this year. He was hitting .260 with five RBIs in 15 games.
The 25-year-old Hamilton, the No. 1 overall pick in the 1999 draft, was suspended in February 2004 for violating baseball's drug policy. He hadn't played since July 2002 because of injuries and unspecified personal issues.
Hamilton received a $3.96 million signing bonus out of Athens Drive High School in Raleigh.
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