BRASILIA, April 30 (Reuters) - Brazil's central bank supervision director, Ailton de Aquino, said on Tuesday he holds a cautious stance and his vote in a monetary policy decision next week hinges on data.

Speaking at a press conference in Brasilia, he said the economic environment outside of Brazil is extremely volatile in light of the repricing of assets following strong U.S. inflation data, while the trend in consumer prices in Latin America's largest economy has been favorable.

Roberto Campos Neto, the central bank's governor, recently said policymakers could no longer provide monetary guidance due to significant uncertainty mainly stemming from external factors.

The central bank's rate-setting Copom committee had signaled in March that it would cut its key Selic rate by another 50 basis points in May, departing from the previous guidance of rate cuts of this magnitude for "upcoming meetings."

Meanwhile, the central bank's director of monetary policy, Gabriel Galipolo, said the monetary authority should not be spooked by "short-term" market fluctuations, as it needs time to understand how recent moves would affect its inflation mandate.

Questioned about his position in this debate, Aquino stressed that he has a "very clear stance" ahead of the policy decision by the nine-member Copom committee next week.

"My position is one of caution, I need to assess the numbers to take my decision. Since it is a collegial body, each member is entitled to their vote," he said.

Aquino emphasized that the external economic situation is "obviously challenging," especially regarding U.S. monetary policy.

The Brazilian central bank has cut the Selic rate by 300 basis points to 10.75% since kicking off an easing cycle in August.

Following strong March labor market data on Tuesday, which sparked discussions among economists about pressures on service sector inflation, Aquino noted that it was still important to monitor inflation in this sector.

Policymakers take job market data "very seriously," he said. (Reporting by Marcela Ayres; Editing by Paul Simao)