There is never a good time, especially in the postseason, to lose a player of Maxi Kleber’s caliber.

But if Mavericks fans are looking for a silver lining after Sunday’s confirmation that Kleber will miss a minimum of three weeks with a right shoulder AC joint separation, there are worse second-round opponents to face under the circumstances than the Thunder.

“Oklahoma’s not a big team,” coach Jason Kidd noted Sunday, after the Mavericks’ first practice in preparation for the Western Conference semifinals, which open Tuesday in Oklahoma City. “We’ve got quite a few bigs that we can go to.”

Not that Kidd in any way is downplaying the significance of losing Kleber, Dallas’ best-defending big man. The reality is there’s nothing the Mavericks can do about Kleber’s absence and, if anything, Dallas on paper has a decided muscle advantage in the middle in this series.

Granted, Thunder rookie sensation Chet Holmgren stands 7-1, but at 195 pounds he will be challenged to contain Mavericks counterparts Daniel Gafford (6-10, 234) and Dereck Lively II (7-1, 230) if they catch the basketball anywhere near the basket.

Starting with MVP candidate Shai Gilgeous-Alexander, 57-win, No. 1 seed Oklahoma City has a talent array that belies the team’s average age of 24, with only one basket scored by a player age 25 or older during its first-round sweep of New Orleans.

Dallas’ two most notable matchup advantages, though, are that it has two superstars – Luka Doncic and Kyrie Irving – to OKC’s one; and that it has become more physically imposing since the Feb. 8 acquisitions of Gafford and P.J. Washington Jr.

Two days after those trades, Dallas hosted OKC in what would be the Mavericks’ only meeting this season against the Thunder with both Doncic and Irving on the court.

Oklahoma City was playing with three days of rest, but the Mavericks pummeled the Thunder 146-111. Despite playing without Lively (nasal fracture), Dallas outrebounded OKC 54-40 and dominated in paint points, 66-34.

“That’s just a regular-season game; playoffs are a little different,” Kidd said. “But making those trades and having Kai and Luka play for the first time against Oklahoma City, we can look at some of the things that we had success with and hopefully we can do that again on Tuesday.”

Kleber, though, not only played in that Feb. 10 game, but started and finished with 12 points and 12 rebounds.

Kleber was limited to 43 games this season, with 38 of his absences coming as a result of a right small toe dislocation. How important is he to Dallas’ success? The Mavericks were 27-16 with him this season; 23-16 without him.

According to NBA.com tracking, opponents shot 43.1% this season when guarded by Kleber, the lowest percentage among Mavericks.

In the first round playoff series, Clippers players shot 27.9% against Kleber before his scary fall and hard landing in the second quarter of Game 6, when Amir Coffee tried to take a charge – after Kleber became airborne.

“Just seeing one of our family members go down that, we all get hit,” Lively said Sunday. “Just being able to know we’ve got to be able to pick him up, there’s a lot of people who were looking at us; a lot of people was questioning what we were going to do.

“Maxi knows that we’ve got his back and we know that he’s going to do whatever we can to get better. But we’ve got to be able to take it game-by-game. Next man up.”

A Mavericks official on Saturday told The News that Kleber suffered a third-degree sprain of his AC joint ligaments. The Clippers’ Chris Paul in 2014 sustained a similar injury and did not require surgery, but he missed 18 games.

The Mavericks on Sunday announced that Kleber will be re-evaluated in three weeks, seemingly meaning the soonest he would be cleared to practice is May 26.

The conference finals are scheduled to begin May 21-22. If Dallas is able to get past Oklahoma City, they would face either Minnesota – a team with a deep and formidable front court – or Denver and MVP favorite Nikola Jokic. If the Mavericks are still alive then, those are challenges they’ll gladly embrace, with or without Kleber.

Until then, they’ll miss him, but in terms of second-round matchups, it could have been worse.

“There’s nothing we can do,” Kidd said. “It’s on to the next guy.”

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