Mitchell was converted from a two-way deal Thursday to a two-year contract with the Thunder, Shams Charania of ESPN reports.
Mitchell underwent a procedure on his turf toe sprain on his right foot and will be re-evaluated in 10 to 12 weeks, Andrew Schlecht of The Athletic reports.
Mitchell (toe) will not play in Friday's game against the Knicks, Clemente Almanza of USA Today reports.
Mitchell (toe) is out for Wednesday's game against the Cavaliers.
Mitchell (toe) will not play Sunday against Boston.
Mitchell ended Sunday's 130-106 win over the Grizzlies with 17 points (6-11 FG, 3-5 3Pt, 2-2 FT), one rebound, three assists and one steal in 22 minutes.
Mitchell is not in the Thunder's starting lineup against the Grizzlies on Sunday, Clemente Almanza of USA Today reports.
Mitchell is in the starting lineup for Saturday's game against the Hornets.
Mitchell ended Monday's 123-105 victory over the Wizards with 16 points (6-7 FG, 2-3 3Pt, 2-3 FT), 12 rebounds, two assists, one block and one steal in 22 minutes.
Mitchell provided two points (1-3 FG), one rebound, two assists and one steal over 10 minutes during Tuesday's 118-104 win over Dallas.