Oklahoma City Thunder guard Russell Westbrook had arthroscopic knee surgery Friday and will be sidelined until after the All-Star break.

Westbrook will miss at least 27 games.

“He will be missed,” coach Scott Brooks said before Oklahoma City’s game Friday night against the Charlotte Bobcats. “Obviously we are a very good team with him, and without him we’re still going to be a very good team.”

General Manager Sam Presti said that Westbrook has been playing pain-free, but “recently had experienced increased swelling” in his right knee.

Presti said the team consulted with a surgeon in Los Angeles and an MRI determined there was “an area of concern that had not previously existed.”

The five-year NBA player is averaging 21.3 points, seven assists and six rebounds for the Thunder.

Reggie Jackson, who is averaging 12.5 points, replaced Westbrook in the starting lineup.

AL HORFORD OUT — Al Horford, the Atlanta Hawks’ leading scorer and rebounder, is out indefinitely with a torn right pectoral muscle, leaving his status for the remainder of the season in question.

Horford left during the first overtime of Thursday night’s 127-125 double-overtime win against the Cavaliers in Cleveland and did not return.

For the Hawks (16-13), the loss of Horford for the season or even for an extended period could be devastating. Following Josh Smith’s exit to Detroit as a free agent, Horford has taken leadership with point guard Jeff Teague and power forward Paul Millsap.

Horford leads the team with 18.6 points and 8.4 rebounds per game.

In his seventh season from Florida, Horford set career highs with his averages of 17.4 points and 10.2 rebounds last season.

CARMELO ANTHONY SITS — Carmelo Anthony will likely miss both ends of the New York Knicks’ home-and-home series with the Toronto Raptors because of a sprained ankle.

Anthony sat out the game Friday night in New York and coach Mike Woodson said he didn’t think Anthony would fly with the team for tonight’s game in Toronto.

Anthony was hurt Monday in a victory at Orlando and missed his first game of the season Wednesday in a loss to Oklahoma City. The NBA’s No. 2 scorer has led the Knicks in scoring in every game he has played this season.

J.R. Smith started in Anthony’s place.

RANDOLPH FINED — The NBA fined Memphis Grizzlies forward Zach Randolph $25,000 for publicly criticizing officials after Memphis lost 100-92 in Houston.

Randolph was unhappy Thursday night that James Harden, who was 2-for-9 from the floor, went to the free-throw line 25 times. Harden was 9-of-11 at the line in the fourth quarter and became the first player in NBA history to register 27 points on two or fewer field goals.

The Grizzlies forward was given a technical late in the game. Afterward, Randolph said the officials made the matchup eight-against-five and dictated the game with what he called “horrible refereeing.”

NOT-GUILTY PLEA — Former Phoenix Suns player Richard Dumas, 44, pleaded not guilty Friday in Glendale, Ariz., after being charged with eight counts of organized retail theft. His next court appearance is set for Feb. 14.

Dumas is accused of taking about $800 worth of items from Luke Air Force Base’s exchange store while working with a janitorial service. Police said Dumas was seen on store surveillance cameras in 2012 taking cigarettes, alcohol, food, DVDs and shoes.

Dumas played for the Suns from 1992 to 1995 and helped Phoenix reach the NBA Finals in 1993. The Suns waived him in 1995 after he missed drug testing.