Swansea City remain in the play off positions thanks mainly to Blackpool's 4-1 defeat at Newcastle rather than their own performance but Sousa believes that they can still make the play offs despite a run of form that has seen them win just once in the last nine games.
Sousa said after the defeat at Ashton Gate "We are still there and we need to keep believing in out quality, talent and team spirit until the end.
"There are three games to go and we need to fight to win every game. We need to push very hard to maintain our place in the top six.
"We had good opportunities before Bristol scored, our main problem at the moment is that we aren't scoring when we are on top.
"We know that if we go in front we have the quality ball players to keep possession and frustrate the opposition.
"By not taking our chances, we are putting pressure on ourselves. But I still have great faith in my players and I firmly believe we can still achieve a play-off place."