The Boston Celtics have lost one of their most crucial pieces to injury in big man Robert Williams. However, the good news for them is that Williams' knee injury isn't as serious as originally thought.

Williams tore the meniscus in his left knee in last Sunday's 134-112 victory at home over the Minnesota Timberwolves. He immediately went under the knife to repair his knee last Wednesday, and it's been reported that it would take anywhere from four to six weeks before he could see action again. Williams also revealed that he instantly knew he suffered something serious as soon as he hurt his knee and that he initially didn't want to have it checked.

Via Tim Bontemps of ESPN:

Robert Williams said he didn’t want to get his knee checked out during the game Sunday night because he knew something was wrong, but was dreading finding out what. Said he’s happy it wasn’t as bad as he initially was afraid it would be.

Williams is a vital cog, especially on defense, for the Celtics this season. He is averaging 9.6 rebounds and 2.2 blocks per game — both numbers are the best on the team. The timetable of his recovery bodes well for his availability in the 2022 NBA Playoffs for the Celtics, who have already assured themselves a spot in the postseason. The playoffs won't kick off until mid-April, so that already shaves around two weeks off Williams' expected playoff availability. Boston could get Williams back as soon as the second round of the playoffs, but of course, that's assuming that the Celtics will avoid getting eliminated in the first round.

For the meantime, the Celtics are increasing the minutes for the likes of Grant Williams and Daniel Theis in the frontcourt together with veteran Al Horford, who currently projects as the team's starting center.