Wrampling was shown a yellow card, later upgraded to red, for a high tackle on Leicester Fainga'anuku in the 19th minute of the 52-31 loss to the Canterbury Crusaders in Christchurch.
The Blues progressed to the semi-finals as the highest ranked losing team in last weekend's three playoffs and will take on the top-seeded Wellington Hurricanes for a place in the final in the New Zealand capital on Saturday.
The Waikato Chiefs host the reigning champion Crusaders in the other semi-final on Friday but will almost certainly be without All Blacks number eight Wallace Sititi for the rest of the campaign.
Sititi was taken to hospital after a nasty head clash with teammate Sione Ahio in the wake of a tackle by Lukhan Salakaia-Loto in the Chiefs' 46-24 win over the Queensland Reds in Hamilton last weekend.
"He's back chirpy and chatting away, so that's good news for everyone," Chiefs assistant coach David Hill told the New Zealand Herald on Monday.
"With two games to go potentially, I don't think he'll be coming back – so, yeah we'll find out in due course."