EAST RUTHERFORD, N.J., June 27 (AP) -- The New Jersey Nets extended a qualifying offer to restricted free agent center Nenad Krstic on Friday, allowing them to match any contract proposal from another team.

Krstic had major knee surgery during the 2006-07 season. The injury limited him to 45 games last season, when he averaged 6.6 points and 4.4 rebounds.

Krstic was the Nets' first-round selection in the 2002 draft. He joined the Nets in 2004 and has averaged 11.3 points and 5.7 rebounds over the past four seasons.