Treyarch has labelled the exodus at fellow Call Of Duty studio Infinity Ward "unfortunate" - but promised the maelstrom surrounding its Activision stablemate hasn't distracted it from creating COD: Black Ops.
Activision CEO Bobby Kotick revealed earlier this month that Infinity Ward has now lost 35 staff members - over a third of its headcount.
The exodus has followed the sackings of former IW heads Jason West and Vince Zampella in March. The pair went on to form Respawn Entertainment - whose games will be published via EA Partners.
"The situation at Infinity Ward is unfortunate," Treyarch's Josh Olin told the latest issue of weekly UK industry magazine MCV.
"It's just not something that we want to let distract us or that we really think about too much.
"We're still focused on our primary charge - to make the best possible game we can - so we're keeping our heads down and staying focused."
Call Of Duty: Black Ops is due for release on PS3, PC, Xbox 360 and Wii on November 9.