Rangers remain nine points adrift of Burnley in second following a 2-0 defeat at Brighton on Tuesday night.
But R's manager Redknapp insisted: "We've got to keep going. It's going to be hard but it can happen."
With two of the Sky Bet Championship's meanest defences taking on two of the meekest attacks, a stalemate always looked on the cards at the Amex Stadium.
That was until the 77th minute when Argentinian striker Ulloa pounced for his sixth goal in eight matches.
Brighton right-back Bruno made a rare foray forward and his low cross was turned in by Ulloa at the far post.
And eight minutes later full-back Ward tapped in the killer second from Kazenga LuaLua's corner.
"It was very frustrating," added Redknapp. "I thought we were just waiting for a goal to come.
"We had all the play, all the chances. We were strong at the back, good in midfield, making chances, but we just couldn't score.
"I thought it would be a hard game but it wasn't, even though we lost.
"I couldn't moan at them, I thought they were excellent for 80 minutes and we got done against the run of play.
"Our keeper had not had a shot to save, then suddenly you're one down. But that's football. It happens."
- Sports & Recreation
- Leonardo Ulloa
- Stephen Ward