"Markets are priced for perfection," Schnabel, the head of the ECB's market operations, told Bloomberg.
Money markets now show investors betting on a peak ECB rate at around 3.75% by late summer, up from levels around 3.4% earlier this month, as a string of hawkish ECB comments in recent days unwound earlier bets.
He and fellow board member Fabio Panetta said the impact of many of the ECB's rate hikes so far had yet to be felt by the economy, with the latter calling for "small steps" going forward.
The ECB raised rates by 50 basis points this month and pre-announced another increase of the same size for March 16.
But it kept an open mind about future moves, with most policymakers expecting another rate hike in May.