"We think that the measures implemented by most central banks in the region are supportive of liquidity but do not remove or reduce credit risk from the balance sheet of banks (yet)," said S&P.
The BoC has signaled that interest rates will stay at a record low of 0.25% until 2023, when it expects the economy to reach its potential.
"They have to acknowledge that the outlook is better," said Andrew Kelvin, chief Canada strategist at TD Securities. "At the same time they don't want to encourage runaway expectations for near-term rate hikes."
US Federal Reserve Chair Jerome Powell failed to soothe investor concerns about a recent surge in borrowing costs as he spoke at a Wall Street Journal forum on Thursday, pushing the safe-haven dollar higher.
Sterling fell to a three-week low against the dollar, briefly dropping below $1.38. It was last down 0.6% at $1.3810.
The average forecast of the benchmark Selic rate at the end of this year rose to 3.75% from 3.50%, while the end-2022 forecast remained steady at 5.00%.
Economists at Barclays reckon the central bank will raise rates at its next policy meeting in March.
The rouble was 0.6% stronger against the dollar at 73.24, hovering at levels seen before Navalny's return to Russia last month. It briefly hit 73.1250, its strongest mark since Jan. 14.
The rouble had gained 0.5% to trade at 88.87 versus the euro , earlier touching a more than two-month high of 88.8000.