The Rockets listed Lin as day to day after he underwent an MRI on Thursday.
He did not practice with the team during an off day in the best-of-seven NBA first-round play-off series, which resumes Saturday in Houston with Game 3. Houston trail 2-0 after losses in Oklahoma City.
Lin was injured in the first half of Game 2 on Wednesday night. He did not play in the second half of the Rockets' 105-102 loss because of pain in the chest area.
Brooklyn Nets general manager Billy King, who put together a team with the fourth-best record in the Eastern Conference, is close to a multiyear contract extension, league sources told Yahoo! Sports.
King's contract would've expired this summer. An official announcement is expected soon, sources told the web site. The Nets went 49-33 this season, and are tied 1-1 in their Eastern Conference first-round play-off series with the Chicago Bulls.
King must still decide on the fate of interim coach P.J. Carlesimo after the season.
Los Angeles Lakers guard Steve Blake joined a growing list of injured team-mates when an ultrasound confirmed a moderate strain of his right hamstring. He's out indefinitely.
Also, Steve Nash and Jodie Meeks remain doubtful for Friday's NBA play-off game against San Antonio. Nash received two epidural injections in his back Thursday, as well as a cortisone shot in his right hip, while Meeks has an MRI scheduled for Thursday on his sprained left ankle.
Boston Celtics coach Doc Rivers has been fined $25,000 for criticising officials after Tuesday night's 87-71 loss to the New York Knicks in Game 2 of an NBA first-round play-off series.
Rivers made his comments in the postgame press conference when he chastised the officials for calling early fouls on the Celtics' Kevin Garnett, who finished with 12 points, 11 rebounds and five fouls in just 24 minutes.
Phil Jackson continues to consider his next move, and it may extend beyond finding a coaching gig. Could a front-office job be in his future?
"I've had some talks with people, and there are some interesting situations that are presenting themselves, but I really haven't made up my mind yet what I'm going to do," Jackson told the San Francisco Chronicle. "None of it involves coaching. ... There are three or four teams that have been interested."