Derrick Williams to join New York Knicks on a $10 million deal.

The Knicks continued to add through free agency by reaching an agreement on Friday with forward Derrick Williams.

The deal is for two years and $10 million, league sources said, and includes a player option for the second year.

Williams thanked fans for their support before confirming the Knicks accord Friday night on Twitter:

New York has approximately $2.5 million in cap space left to spend in free agency. The club also has access to the $2.8 million room exception, as they spent $54 million on Robin Lopez for four-year  and $16 million on Arron Afflalo for two years

Williams, an unrestricted free agent, has been a bust since the Minnesota Timberwolves made him the second overall pick in the 2011 draft. The power forward has averaged just 9.3 points and 4.3 rebounds in his four seasons, paltry numbers for a player the Wolves had counted on to be the foundation of their future.

That never happened, and Minnesota was quick to cut ties with the former Arizona standout, trading him to the Sacramento Kings in November 2013.

Williams wasn't been much better in Sacramento Kings, and after a zero-rebound game in April, and  coach George Karl said of his 6-foot-8 power forward:

 "You shouldn't be playing 20 minutes a game and not get a rebound. I mean, the Coke machine can get a rebound some nights."

Williams did perk up some down the stretch in 2014-15, averaging 14.8 points and one 3-pointer per game. Hopes are the 24-year-old can continue that into next season with the Knicks.