All-Star point guard Ja Morant is "week -to-week" after the Memphis Grizzlies confirmed he had sustained a Grade 1 left ankle sprain.

Morant had to be helped off the court in Friday's 121-110 win over the Oklahoma City Thunder after getting tangled with Lu Dort in the fourth quarter.

The 23-year-old is averaging 28.6 points and 7.1 assists per game this season for the Grizzlies, who are already without Desmond Bane, who will be re-evaluated in two to three weeks due to a Grade 2 sprain of his right big toe.

"After further evaluation, it was determined that Memphis Grizzlies guard Ja Morant suffered a Grade 1 sprain of his left ankle during the November 18 game against the Oklahoma City Thunder," the franchise announced on Saturday.

"Morant's return to play timeline will be week-to-week, and updates will be provided as appropriate."

The Grizzlies are scheduled to face the Brooklyn Nets on Sunday, with Kyrie Irving potentially returning for the home side at Barclays Center.

Memphis are also due to play the Sacramento Kings on Tuesday and the New Orleans Pelicans on Friday.

Meanwhile, ESPN have reported that Philadelphia 76ers guard Tyrese Maxey will miss three to four weeks with a small fracture in his foot revealed by an MRI from Friday's 110-102 loss to the Milwaukee Bucks.