Wales rallied from a 2-1 deficit in the first leg, behind 2-0, to win 3-2 overall, with Holland’s goal eight minutes from the conclusion of extra time capping their comeback.
In an attempt to earn a spot in their first major tournament, Wales will now play the Republic of Ireland in the play-off final.
“I believe I just scored the most significant goal of my professional life. Slovakia made it really tough for us tonight, despite the amazing fans,” Holland told Match of the Day Wales.
They made things tough for us out there, but it’s amazing to see how much it meant to everyone and finish the job. In this group, creating a significant competition for our nation is everyone’s dream. Even if we’re almost there, there’s still a lot of work to be done.
We are warriors, and we are Welsh. The dragon is something we wear on our hearts. Sometimes we need to be a little more composed, but we never lack a fight.
“We realized that on Friday, we weren’t ourselves. We made amends tonight after having some difficult talks.