Cooper signed a two-way contract with the Lakers on Tuesday, Benjamin Royer of The Orange County Register reports.
Hart (illness) won't play Tuesday against the Bucks, Kristian Winfield of the New York Daily News reports.
Reaves (illness) is off the injury report for Wednesday's game against the Bucks, Ryan Ward of SI.com reports.
Grimes (finger) is listed as questionable for Wednesday's game in Milwaukee.
Lovering was waived by the Lakers on Tuesday, Michael Scotto of HoopsHype reports.
Hart is doubtful for Tuesday's game against the Bucks due to an illness.
Mamukelashvili logged 23 points (7-13 FG, 5-8 3Pt, 4-4 FT), eight rebounds, three assists, one block and one steal over 32 minutes during Monday's 124-114 win over the Hawks.
Kessler recorded 21 points (8-12 FG, 5-6 FT), 10 rebounds, four assists, one block and one steal in 30 minutes during Monday's 124-114 victory over the Hawks.
Reaves recorded 43 points (14-27 FG, 4-6 3Pt, 11-11 FT), five rebounds and four assists in 36 minutes during Sunday's 121-116 win over the Pistons.