The Canadian dollar may struggle in 2020 to top its stellar performance from this year.

That's the message from the global head of foreign-exchange strategy at Credit Suisse who expects the tailwinds seen in 2019 to fade. While risk-sensitive currencies like the loonie should perform well if the global economy continues to firm, Shahab Jalinoos believes Bank of Canada policymakers will be quick to try to curtail a significant rise.

"The key risk is the BOC itself, which tends to talk more dovishly whenever CAD shows material strength," Jalinoos said, using the market abbreviation for the Canadian currency. Additionally, the Bank of Canada's search for a new chief may "create some uncertainty that hinders CAD appreciation," he said. The central bank has formally started its hunt for a successor to Stephen Poloz, who is stepping down as governor in June.

The Canadian dollar is on pace to be the best-performing major currency in 2019, notching an almost 5% gain against the greenback in a year that saw foreign-exchange volatility sink to record lows. Resurgent commodity prices helped buoy the currency, as did a central bank that kept borrowing costs steady, making it an outlier in the global easing trend.

For those reasons, Jalinoos sees the dollar-loonie rate consolidating around $1.28 per Canadian dollar. The pair fell for a fifth straight day to drop below C$1.30 for the first time in over a year on Tuesday.

One technical indicator paints a brighter picture for loonie bulls. The pair trade is on track for a monthly close well below its long-run trend support at C$1.3155, which would provide a clear signal that there's more U.S. dollar weakness in the offing. While charting patterns suggest firm support for the greenback in the low- to mid-C$1.30 range — a level breached on Tuesday — there may be little in the way of longer run supports until the C$1.28 zone.

Still, Bannockburn Global Forex sees the Canadian dollar's run largely stalling out, with a 2020 year-end forecast of C$1.295. While the nation's economic growth was resilient to a global slowdown in 2019, the data is poised to soften, according to the firm's chief market strategist Marc Chandler.

"The Canadian economy is weakening and the central bank will have to cut rates," Chandler wrote in an e-mail. "Typically, in a weakening USD environment, CAD lags on crosses."