Goldman Sachs don't rule it out:
"A return to large-scale QE is complicated by the ECB's self-imposed limits on its asset purchases. But significant headroom remains to expand corporate sector purchases and we estimate that the ECB could buy up to €400 billion in sovereign debt under the current constraints. A limited QE program - for example, with monthly purchases of €30 billion for nine month - seems feasible within existing constraints."
Justin had the post and added A LOT more. Do check it out:
Is the return of QE imminent for the ECB?
The final act of the magician?