The Pelicans announced Friday that McCollum was diagnosed with a right adductor strain and is expected to miss at least 2-3 weeks.
McCollum (thigh) won't play Friday against the Pacers.
McCollum is inactive for Wednesday's game against Golden State due to right adductor soreness.
McCollum closed Tuesday's 124-106 loss to the Warriors with five points (2-8 FG, 1-4 3Pt), six rebounds, five assists and two blocks over 31 minutes.
McCollum ended Friday's 105-103 victory over the Trail Blazers with 20 points (8-17 FG, 4-9 3Pt), two rebounds, three assists, one block and four steals in 40 minutes.
McCollum finished Wednesday's 123-111 win over the Bulls with 23 points (9-19 FG, 5-11 3Pt), two rebounds, five assists, one block and one steal in 30 minutes.
McCollum recorded eight points (3-11 FG, 2-8 3Pt), five rebounds, three assists, a steal and a block across 20 minutes in Tuesday's 118-98 preseason loss to the Rockets.
McCollum supplied 20 points (9-22 FG, 2-9 3Pt), three rebounds, six assists, one block and one steal in 39 minutes during Sunday's 94-92 loss to Oklahoma City in Game 1 of the Western Conference Quarterfinals.
McCollum supplied seven points (3-8 FG, 1-2 3Pt), two rebounds, three assists, two blocks and one steal over 36 minutes during Friday's 105-98 Play-In Game win over the Kings.
McCollum recorded 25 points (9-19 FG, 4-9 3Pt, 3-4 FT), four rebounds and seven assists across 34 minutes during Sunday's 124-108 loss to the Lakers.