LAS VEGAS — The Celtics’ response to losing Ray Allen to the Heat was their relentless pursuit of free agent guard Courtney Lee. And although neither president of basketball operations Danny Ainge nor coach Doc Rivers would officially comment Thursday night, two NBA sources said the Celtics have completed the framework of a deal that will bring Lee to Boston in a sign-and-trade with the Rockets.

According to the sources, the Celtics will send JaJuan Johnson, E’Twaun Moore, Sean Williams, and a 2013 second-round pick to Houston for Lee, who will be entering his fifth NBA season.

Johnson, Moore, and Williams will earn a combined $2.7 million next season, and the Celtics could also sign an additional player, such as Mickael Pietrus or Keyon Dooling, to include in the deal to be able to increase Lee’s salary.

The Celtics dropped a 91-82 summer league decision to the Kings on Thursday, and Johnson was not with the team at the Thomas & Mack Center. Williams arrived in Celtics gear, took some shots, and then was pulled off the court for a conversation with Rivers.

Moore was wearing his Celtics jersey, but had sandals on, and headed out of the arena after a conversation with Rivers. Williams and Moore have nonguaranteed contracts for next season and are expected to be waived by the Rockets. Johnson has a guaranteed contract, but, according to an NBA source, will request a trade from the Rockets.

General manager Daryl Morey is overhauling the Rockets’ roster, trying to acquire assets and salary-cap space for a Dwight Howard deal or to acquire another superstar. The key to the trade may be the second-round pick, which was originally owned by Charlotte and which could be in the 30s overall.