Studies are underway into whether the Quirk administration's signature project, the Brisbane Metro, could be operated by articulated "banana" buses instead of rubber-tyred trams.

But the councillor charged with delivering the project, deputy mayor Adrian Schrinner, insisted on Tuesday it was incumbent on the council to look at all options.

The admission came in the council's public and active transport committee on Tuesday morning, under questioning by Labor councillor Jared Cassidy (Deagon).

Cr Cassidy asked Cr Schrinner about comments Lord Mayor Graham Quirk had made at a recent suburban civic cabinet meeting, that the metro's business case would look at a high-capacity bus system instead.