He has made brief bench appearances in the last two games, including last week's 38-14 thumping of the Bulls.
Umaga's other change is at openside flanker, where Blake Gibson makes way after starting all five games this year.
In his place is the versatile Murphy Taramai, whose four appearances this year have featured one start, at No.8 against the Highlanders.
The Blues have suffered losses to three Kiwi opponents this season but will be encouraged that their two hefty wins have come against overseas opposition.
The Force, who are coming off a heavy loss to the Crusaders, have won just once in 10 clashes with the Blues.
Blues: Michael Colllins, Matt Duffie, George Moala, TJ Faiane, Melani Nanai, Piers Francis, Augustine Pulu, Jerome Kaino, Murphy Taramai, Jimmy Tupou, Patrick Tuipulotu, Gerard Cowley-Tuioti, Charlie Faumuina, James Parsons (captain), Pauliasi Manu. Reserves: Matt Moulds, Ofa Tu'ungafasi/Sam Prattley, Sione Mafileo, Scott Scrafton, Akira Ioane, Billy Guyton, Ihaia West, Rieko Ioane.MORE MG