The company said its beer sales in Europe rose from year-ago levels in August and September as drinkers returned to bars after pandemic-related restrictions were lifted.
A recent surge in infections and return of lockdowns in the region meant such improvements were unlikely to last, it said.
It also reported on Thursday its core operating profit for the nine months through September fell 20% from a year earlier to 131 billion yen ($1.26 billion).
($1 = 104.3800 yen)
(Reporting by Ritsuko Ando; Editing by Jacqueline Wong)