Hamilton Academical keeper McGovern replaces veteran stopper Roy Carroll for the game in Belfast, while Dallas is preferred instead of Niall McGinn after scoring his first international goal against Qatar last month.
West Bromwich Albion winger Chris Brunt will earn his 50th cap.
Meanwhile, Vlad Chiriches starts for the Group F leaders in the heart of defence, while Fiorentina keeper Ciprian Tatarusanu is preferred in goal. Sunderland stopper Costel Pantilimon is not part of the squad.
Northern Ireland: McGovern, McLaughlin, Evans, McAuley, Brunt, Baird, Davis, Norwood, Lafferty, Dallas, Ward
Romania: Tatarusanu, Grigore, Chiriches, Lepsi, Papp, Chipciu, Pintilii, Maxim, Torje, Prepelita, Keseru
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