The pair, ranked second and fourth in the world respectively, led the Swiss to their first-ever Davis Cup success last season but both players opted not to play in this year’s first-round tie against Belgium. It was no surprise when the Belgians won 3-2.
However, with Switzerland’s place in the top tier now under threat, both men have made themselves available for the September 18-20 home tie against the Netherlands.??Swiss Tennis confirmed the news on Friday.
Switzerland have spent only two years outside the World Group since 1995 but will need to beat the Netherlands in order to keep their place in the top tier.
Federer has spent the past week in Malawi as part of a charity project. The Wimbledon runner-up is due to return to action in Montreal next month.
Wawrinka is currently nursing a shoulder injury which has ruled him out of next week’s Swiss Open in Gstaad.