We didn't expect the decision to have such serious/enormous/tremendous 'repercussions'. [='consequences']
We did not consider the possible 'repercussions' of our actions.
(..) Warm up. Welcome to Norway. - Not such a great day, son. - Hey. I got a call from the boss. There'll be repercussions. Hefty fine probably. Nil-nil and he had me sitting on my freezing ass for minutes. He's the coach, son. He calls the shots. He's sending a message. You should listen. (..)2007 Goal II: Living the Dream