Sir David Murray says Rangers are determined to win the title

Rangers chairman Sir David Murray has rounded on his critics and fans upset over the sale of Carlos Cuellar.

Supporters of the club reacted angrily to the decision to sell the Spanish defender to Aston Villa for �7.8m.

But Sir David, who bought Rangers for �6m in 1988, told BBC Scotland that the money would be reinvested in the side.

And the 55-year-old, who said he had invested �100m in the club, confirmed interest in signing defender Glenn Loovens and midfielder Mark Bresciano.

Sir David was responding to criticism of his reign and disappointed supporters who have watched their side crash out of Europe against FBK Kaunas and lose one of their best players to the English Premier League.

The Rangers chairman has said in the past that he would only sell to someone who could take the club forward.

Cardiff City defender Loovens and Palermo midfielder Bresciano are two of the players being linked with a move to Ibrox.

The Rangers chairman said he was determined to steer the club to further success, but would be happy to relinquish his role if a suitable offer was made.

"I've been here 20 years and I've let it be known that if someone comes along and they can do better than me, then I won't be difficult to deal with," he told BBC Scotland.

What were we meant to do with Cuellar? Financially it was a good deal, football-wise it wasn't Sir David Murray

"But, in the meantime, I've got a big job to do here until that time comes. The criticism is cheap without knowing all the facts."

Responding to criticism of Cuellar's sale and the clause in his contract allowing him to leave if a �7.8m offer was made, Sir David said: "Every contract has different nuances.

"And I would say this to people who criticise after the event. When you sign a player a year ago for three million euros and you put in 10 million euros with no cuts going to other clubs, well I think financially, it's good business.

MY SPORT: DEBATE What do Rangers fans think of Sir David Murray's comments?

"Football-wise, it's not good business for us but what I would say is that when Carlos decided to take up that clause it put us in a difficult position.

"We then put that out on the website. But then people who want to be mischievous put all the different twists on it.

"What were we meant to do? We took the funds and we'll spend that income."

Sir David said he was remaining "strong" in the face of recent criticism and admitted everyone connected with the club was disappointed at their European exit.

"What we've got to do is rebuild, get stronger and ensure we win the title this year."