Derby County were not the same side once veteran midfielder John Eustace left - and Chris Barid's seemingly impending exit may have a similar effect.
Rangers are still trying to complete a deal with John Eustace.
Rangers have been linked with George Glendon and John Eustace recently.
Rangers still want to complete a deal for John Eustace
Rangers are close to agreeing the signing of John Eustace.
Rangers will be signing John Eustace in the coming days, according to Warburton.
The veteran midfielder joined on trial earlier this summer but is yet to officially join the club.
The 35-year old joined on trial in July, but is yet to sign a permanent deal.
Rangers manager Mark Warburton is hoping to sign John Eustace this month.
Andy Halliday says he would be 'delighted' to see John Eustace complete a permanent move to Rangers.