Los Angeles Clippers guard Terance Mann. Gary A. Vasquez-USA TODAY Sports

The Clippers‘ refusal to part with Terance Mann continues to be the main obstacle to a potential trade involving Sixers guard James Harden, reports Sam Amick of The Athletic.

Two people involved in the negotiations tell Amick that the teams talked again on Monday, with Philadelphia offering to give up Harden in exchange for Mann, an unprotected first-round pick, a first-round pick swap and other players to match Harden’s salary. However, Clippers president of basketball operations Lawrence Frank refused to make Mann available, which has been the team’s position since trade talks began.

Sixers president of basketball operations Daryl Morey said Frank was being “unserious,” according to Amick’s sources, and sarcastically suggested the Clippers should offer Paul George if they’re so determined to hold onto their lesser assets. Frank quickly dismissed the idea of parting with George.

Amick notes that the exchange leaves negotiations at the same impasse where they began when Harden made his trade demand in late June. The Sixers don’t have any traction on a deal with L.A. or anyone else as the start of the season looms next week.

Harden showed his displeasure with the situation by skipping Wednesday’s practice and has been away from the team since Sunday. An earlier report said management plans to give him a chance to explain his absence before imposing any fines, which would start at $2,500 for a missed practice and could reach $389K for each missed game.

Harden is communicating with the Sixers through general manager Elton Brand, according to Amick. Harden remains angry at Morey over the way his contract was handled, and it’s not clear what his intentions are regarding the Oct. 26 season opener.

The Sixers believe Harden’s anger should be directed at the Clippers, Amick adds. The position of Philadelphia’s front office is that Harden could have the trade he wants if L.A. would include Mann, and the Sixers would be left with enough assets to pursue a high-level player who could replace Harden and keep the team in title contention.

Sources tell Amick that Philadelphia already has trades lined up that would fetch a first-round pick in exchange for Mann. That pick would be used as part of a package to acquire another star later in the season. The Sixers see that as an equitable outcome considering the otherwise limited return they would be getting in exchange for Harden, according to Amick.

However, Harden believes L.A. has already made a reasonable offer and Morey is “moving the goalposts,” Amick adds. The Clippers have offered two first-round picks, but Morey isn’t satisfied with their quality because they could eventually turn into second-rounders if they don’t convey by a certain date.

Harden’s absence is the latest step in his desire to create an uncomfortable situation for the Sixers until he’s traded, Ramona Shelburne of ESPN stated in an appearance on “NBA Today.”

“Somebody close to him told me this is only the beginning of what he plans to do here,” Shelburne said.

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