Bayer Leverkusen's Bundesliga and DFB-Pokal double was the result of players keeping faith in the team throughout what turned into a dream season, so says Xabi Alonso.

Leverkusen added the Pokal to their Bundesliga crown with a 1-0 victory over second-tier Kaiserslautern.

Granit Xhaka scored the only goal of the game as he arrowed in from distance in the 16th minute.

"In the end, to win like that meant we showed spirit, we fought for the fans for the club," said Alonso.

"It is a huge success to win the double. We will remember this in the future."

Leverkusen lost only one of 53 matches across all competitions this season, with that sole defeat coming in Wednesday's Europa League final against Atalanta, denying them a treble.

"The most important thing was the belief of the team. They were ready to battle with 10 players and I am proud of that," Alonso said.

"I need time to accept what happened this season. It was a dream season and to celebrate the last day like this here is special."

Leverkusen will be looking to build on their success next season, with Alonso having snubbed the advances of Liverpool and Bayern Munich in order to stay at the club.