The midfielder wore the captain’s armband with Dan Neil among the substitutes as the Gers were forced to wait until the final ten minutes to find the breakthrough against Stephen Robinson’s side.
Speaking to RangersTV after the victory, the Belgian commented: “I’m delighted for the team. We worked hard and now we have a cup final to play.
“You come here, the other team is prepared, have a plan, they have full belief in what they do, so it's always tough.
“It's never easy to win a football game. I thought we could have helped each other by scoring perhaps earlier.
“But the goal came at the end. I’m so happy for Ryan [Naderi]. It was a well-deserved goal, and now we move on.”
On the Czech’s winning goal, Raskin continued: “The goal today is a typical Ryan Naderi goal. It's just good to see him scoring like that.
“I think he has a beautiful partnership up front with Kevin [Kelsy].
“We see how Bojan [Miovski] gives everything in training to keep pushing them, and then we have Shanks and Youssef [Chermiti] on the sidelines who can't wait to come back.”
It was another important victory delivered by the side to maintain their unbeaten run under Derek McInnes.
The midfielder believes the team are growing week by week, and he can’t wait to return to Mount Florida next month for the final.
Raskin added: “A new team is never easy because you will always have some bumps here and there.
“The season is very long, so we're just trying to keep calm, keep believing in what we're doing, focus on what we're doing, and following the manager's instructions.
“It’s just about us trying to keep improving, keep helping each other and focus on us.
“It’s great to have [the fans] here and it will be great to go to the final with them and hopefully we can win it and make everyone happy.”