The French big man went down awkwardly two minutes into Utah's 107-95 win over Boston on Friday.
He tangled with teammate Derrick Favors, who was trying to elude a Celtics defender but fell onto Gobert's left leg.
Gobert tried to rise, but fell back clutching his knee in pain.
Surrounded by his teammates and team medical personnel, he remained on the court for several minutes before making his way to the locker room.
On Saturday he underwent an MRI exam which revealed a left knee sprain, the team said in a statement.
The Jazz said Gobert's injury would be re-assessed in two weeks, and further updates would be provided "when appropriate".
Multiple US media outlets reported Gobert would be sidelined up to four weeks.
The seven-foot-tall Gobert is currently averaging 11.6 points, 9.6 rebounds and 2.3 blocks per game in his fifth NBA season.
source: news.abs-cbn.com
