Lyn Jones urged London Welsh to keep believing after a late Freddie Burns penalty saw them defeated at Gloucester.
The bottom side appeared on course for a shock win at Kingsholm when they led 14-6 with less than 20 minutes to play, but Burns capped a home fightback with a winning kick which leaves the Exiles five points adrift at the bottom with our games to play.
The imminent verdict on the club's appeal against a five-point deduction now looks key to their survival hopes, but Jones will keep plugging away.
He said: "When I joined London Welsh I said there wasn't an experience in rugby that I hadn't come across, but I was wrong. What is going on is another test that is energy-sapping.
"We just to try to keep our focus on what we can influence, which is results and the scoreboard. We need to keep believing.
"When you are a professional sportsman, 80% of the time is dealing with rejection and disappointment, and you have to have a mental toughness to deal with that.
"There is nothing we can do in terms of the appeal, but when we are on the field we can do something about it, which is what I keep telling the players. Can we win the four games? Potentially, we can."
Gloucester remain on course for a play-off place, and rugby director Nigel Davies said: "I am relieved at getting the four points.
"London Welsh made it very difficult for us, which we knew they would. They had a real cause today, and they represented that cause very well.
"Every point at this stage of the season is vitally important. If we can win our next four games we will probably be in the top four."