Porzingis signed a $158 million, five-year max contract with Dallas in July 2019.
Payne has spent the last 10 years at Kentucky, where he has been John Calipari's associate head coach since 2014.
Thibodeau was hired Thursday, returning to the team he helped lead to the NBA Finals as an assistant.
Ewing announced on Friday that he had tested positive for the coronavirus and was being treated at a hospital.
The Knicks announced that Dolan had tested positive on Saturday night. It is not clear when he was tested or when he received the diagnosis
NBA: New York Knicks superfan Spike Lee won't watch games at Madison Square Garden this season after elevator quarrel
Spike Lee said he had has been using the employee entrance on 33rd Street for more than two decades as a season ticket holder. The Knicks wanted him to use the entrance for celebrities, which is two blocks away.
NBA: Struggling New York Knicks attempt to follow Warriors, Lakers blueprint, hire agent Leon Rose as president
Rose has represented such All-Stars as LeBron James, Chris Paul and former Knicks forward Carmelo Anthony, along with current young stars Joel Embiid and Karl-Anthony Towns
NBA: New York Knicks sack president Steve Mills with trade deadline approaching, GM Scott Perry to take over operations
The Knicks said it was anticipated that Mills would be nominated to the board of MSG's standalone sports company following the completion of the proposed spinoff of the entertainment business
NBA: Jimmy Butler scores season-high 38 points as Heat thrash 76ers; Kristaps Porzingis powers Mavericks to victory
Goran Dragic scored 24 points for Miami, Duncan Robinson had 19 and All-Star Bam Adebayo finished with 18 points, 11 assists and eight rebounds for the Heat
NBA: Damian Lillard sets Trail Blazers record with 61 points; Kemba Walker powers Celtics to win over Lakers
Kemba Walker scored 20 points to end a career-long personal losing streak against LeBron James, and Jayson Tatum scored 27 to help Boston send the top team in the Western Conference to its biggest loss of the season
NBA: Rookie guard Ja Morant powers Grizzlies to sixth straight win; Kawhi Leonard scores season-high 43 points
Rookie guard Ja Morant missed only one of his 11 shots as the Grizzlies extended their longest winning streak since December 2016
NBA: Goran Dragic scores 29 points as Heat ease to victory over Trail Blazers; Clippers edge past Knicks
Dragic tied a career-best with seven 3-pointers. Derrick Jones Jr scored 19 points for the Heat, who got 14 from Kendrick Nunn and 12 points in 22 minutes from little-used James Johnson — who was called upon largely because Miami was without Jimmy Butler
NBA: Mitchell Robinson, Julius Randle power Knicks to win over Trail Blazers; West-leading Lakers ease past Suns
Portland’s Damian Lillard was held to 11 points on 5-for-20 shooting after scoring 30 or more in the previous three games
NBA: Marcus Morris sinks clutch three-pointer to power Knicks to victory; Heat hold on against Cavaliers
Morris' game-winning shot capped a back-and-forth fourth quarter in which there were five ties. Seth Curry put back a Tim Hardaway miss to level the score at 101-101 with 38 seconds left
NBA: LeBron James posts second straight triple double to lead Los Angeles Lakers past San Antonio Spurs
Davis had 25 points and 11 rebounds, LeBron added 21 points, 13 assists and 11 rebounds and Los Angeles Lakers held off the San Antonio Spurs 103-96 on Sunday night.
NBA: Brooklyn Nets pip New York Knicks in Big Apple showdown; Los Angeles Lakers bounce back after losing start
The Nets, out to make Brooklyn the center of New York City's NBA universe, edged the Knicks 113-109 Friday, but not before a fourth-quarter dogfight.
NBA: Zion Williamson continues pre-season hot-streak as Pelicans beat Jazz; Giannis Antetokounmpo powers Bucks to victory
Williamson scored five of the Pelicans' first seven points, including his first 3-pointer of the preseason. He finished the first half with 10 points, but was even better after the break
First Asian-American NBA champion Jeremy Lin struggles to find takers in USA, joins Chinese team Beijing Shougang Ducks
Lin has struggled with injuries and inconsistency since he led the New York Knicks to a seven-game win streak in 2012 to level their record at 15-15
Carmelo Anthony, who had spent six years with the Nicks and eight years with the Nuggets had joined the Rockets last year from Oklahoma City Thunder, is now a free agent.
Twenty-six of NFL's 32 teams, including Dallas Cowboys, appear on the list of the 50 most valuable clubs in the world.