There's currently a forecast of 37 degrees for Canberra on Sunday, with United scheduled to kick-off at McKellar Park at 4.30pm - right when the ACT could be at its hottest.

But the FFA wants to push the kick-off back and will announce a new kick-off time on Thursday.

W-League head Greg O'Rourke said schedule changes were made with the interests of players, match officials and supporters in mind.

It won't be the first time extreme heat has forced the FFA to delay a Canberra game, with last season's semi-final against Melbourne City shifted from 2pm to 8pm due to a 34-degree forecast.

"The safety and comfort of players, as well as those working at or attending FFA sanctioned matches, is of paramount importance to FFA," O'Rourke said on Wednesday.

Meanwhile, Canberra defender Ellie Carpenter is in the running for the W-League young footballer of the year award after she was named the December nominee on Wednesday.

She joins the Melbourne Victory's Kyra Cooney-Cross as a nominee, after Cooney-Cross was nominated for November.

Carpenter's nomination comes despite United suffering a three-game losing streak during December that has seen them slip to sixth on the W-League ladder - four points, but with a game in hand, behind the fourth-placed Perth Glory.

Despite being 17, the defender is already an established member of the Matildas squad.