The 24-year-old netted his fourth goal in three games, taking his total tally to six in just four starts.
Gyan believes Sunderland have demonstrated immense potential this season and confidence is flowing throughout the squad.
"Everything is working out well," said Gyan. "I thank God for that because I am a good Christian.
"All the players did well. We have a good team with good players. We must believe in ourselves because with the kind of players we have, we should have confidence in ourselves that we can go places.
"We have proved that everything is possible. We worked hard and every time we got the ball, we played. We were not scared."