The head of SBS has warned that coverage of the Tour de France and the soccer World Cup are at risk if the Government slashes any more funding from the broadcaster.

In the federal budget, the Government announced the SBS will face cuts of around $8 million over four years.

A current efficiency review into the broadcaster is expected to find further savings.

SBS managing director Michael Ebeid has told a Senate estimates hearing the broadcaster is already "chronically underfunded".

He said he cannot guarantee their flagship coverage of events like the soccer World Cup will be safe.

"It's a significant amount of money every four years for us," he said.

"If there are deep cuts, obviously we'd need to look at everything – whether it be news, current affairs, language programs or sporting events."