Posh will take on Chesterfield in the JPT final at the end of March, but Washington believes that his team could return a couple of months later in the League One play-off final.
"Obviously, the place is buzzing with the lads getting to Wembley," Washington told ITV News Anglia.
"Everyone's really excited and it's a great opportunity for all the lads. Now we've got to fight hard for the rest of the season to hopefully get there again."
Peterborough travel to local rivals Stevenage on Saturday in a game which carries huge significance at both ends of the table.
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A hospital in Suffolk is launching a new multi-million pound electronic record system in the hope it will help improve patient care.
It will be a breezy morning but largely dry with some brightness. Rain will sweep in from the west during the afternoon. Highs of 16 deg C.
Becoming cloudier and breezier into the evening, with a little light rain at times. It will be much milder than of late. Lows of 7 deg C.