DALLAS (AP) — The Golden State Warriors were working Friday to finalize a trade to send center Willie Cauley-Stein to the Dallas Mavericks for a second-round draft pick this summer.A person with direct knowledge of the trade discussions confirmed the swap of Cauley-Stein was in the works and anticipated it would be completed soon, speaking on condition of anonymity because the deal had not been finalized.The Mavericks also made a roster-clearing move by trading rookie Isaiah Roby to Oklahoma City for Justin Patton and cash. A person with direct knowledge of the deal said Dallas was planning to waive Patton. The person spoke on condition of anonymity because no decision on Patton had been announced.Dallas had a sudden need for a big man after starting center Dwight Powell tore his right Achilles tendon in a loss to the Los Angeles Clippers on Tuesday night.The 7-foot Cauley-Stein, who missed all of training camp and the exhibition games because of a left foot injury, is averaging 7.9 points, 6.2 rebounds, 1.5 assists and a team-leading 1.22 blocks in 41 games with 37 starts for the Warriors. He has scored in double figures 17 times.A video of Cauley-Stein was still included on Golden State's Twitter feed for “Game Day" ahead of a matchup Friday night against the Pacers at Chase Center.The No. 6 pick in the 2015 draft, Cauley-Stein averaged 10.1 points and 6.4 rebounds with the Sacramento Kings during the 2018-19 season before joining the Warriors.Patton was the 16th overall pick by Chicago in 2017 but has played sparingly in three seasons with three teams: Minnesota, Philadelphia and Oklahoma City.Roby was a second-round pick by the Mavericks last season and has yet to make his NBA debut. He's been shuffling back and forth between the Mavericks and the Texas Legends, their G-League affiliate.___More AP NBA: https://apnews.com/NBA and https://twitter.com/AP-Sports