David Weir insists there is no chance of Rangers underestimating Kilmarnock on Tuesday night after watching Celtic suffer defeat in their last visit to Rugby Park.
Rangers make the trip to Ayrshire hoping to increase their 10-point lead at the top of the Clydesdale Bank Premier League, but Weir believes that advantage will count for nothing if they are not on top form against Jimmy Calderwood's men.
"All the games in the SPL are tough but the away games are particularly hard," said the Ibrox skipper. "You don't get any easy games anywhere and we know Kilmarnock always give us a game. Celtic went there recently and it was a tough game. We know it will be the same for us."
He added: "We know we will have to perform and give it our full attention and we can't be any less than what we need to be.
"We have to get ourselves right and be up for it or we know we won't win."
Calderwood's side dented Celtic's title hopes when they beat them 1-0 at the start of February.
However, the former Aberdeen and Dunfermline boss knows his team have their work cut out stopping the Ibrox side.
"We are under no illusions," the Killie boss told Press Association Sport. "Rangers have lost just one league game all season, at Aberdeen, and that is notoriously a difficult place for them to go as I know.
"They have performed unbelievably brilliantly to be 10 points clear by this stage of the season and they haven`t bought anyone for donkey's years.
"They are a strong unit and you know that if you go behind against them then it is going to be very difficult, they don't have many goals scored against them. But we have nothing to lose."
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