The Serbian champions scraped through the last round on away goals to Estonian outfit Levadia Tallinn, those matches costing previous boss Bosko Djurovski his job when he was urged to tender his resignation late on Thursday night.

His successor already finds himself under pressure after Red Star opened the new league campaign with an unconvincing goalless draw against newly-promoted Cukaricki on Saturday.

Kosanovic has now promised a more positive approach against Rangers at Ibrox, before what is sure to be a daunting return leg at Belgrade's imposing 'Marakana' stadium for Walter Smith's men on August 28.

"The most important thing is to play our own game," said Kosanovic.

"We will not go there to defend ourselves and we will certainly use every opportunity to attack the Rangers goal.

"Nobody can guarantee us success in the return leg if we just defend ourselves in Glasgow.

"We will play tough and try to convert every opportunity that we get."

Red Star won the Serbian championship with a resounding 17-point advantage over city rivals Partizan, who were beaten by Rangers in the UEFA Cup last season.

But Kosanovic claims not to be overly concerned by their uninspiring stalemate at the weekend ahead of such a crucial European match.

He added: "We are still in the early phase where we are building our game plan and gauging the players' capabilities.

"My main goal before this match was to find the best starting line-up for the upcoming match in Glasgow, and I think that I have succeeded in that.

"Against Cukaricki we showed both our resolve and patience.

"We created a lot of space on the wings, but we lacked some luck in converting those opportunities into goals."