Dell Inc is cautiously optimistic that its strong performance in Europe and Asia will continue, but is concerned about U.S. government spending, an executive said.

Steve Schuckenbrock, who runs the U.S. company's $8 billion services business, told Reuters it was yet to be seen whether a typical September spending surge as U.S. federal budgets close would happen this year.

"We're continuing to monitor demand big-time, as European issues, U.S. issues continue to get debated and discussed," Schuckenbrock said in an interview in London on Tuesday.