Kingston, July 12 -- Australia's Test captain Pat Cummins is set to sit out next month's white-ball series against South Africa as he shifts focus to building up his fitness ahead of the Ashes later this year, as per ESPNcricinfo.

Cummins had already been rested from the ongoing T20I series against the West Indies, along with Mitchell Starc and Travis Head. Now, fellow fast bowler Josh Hazlewood, who was initially named in the squad for South Africa, will also return home following the Test series. Xavier Bartlett has been drafted in as his replacement.

"I'll have a good training block for the next couple of months, six weeks or so," Cummins told reporters, as quoted from ESPNcricinfo.

"Probably not bowling, but lots of gym work. (My) ...