Burke, who is still recovering from ankle surgery, could only watch as his team-mates lost 2-1 against FBK Kaunas on Tuesday to end their Champions League campaign at the first hurdle.

Without another UEFA Cup run to fall back on, the early departure from European competition has seen fans point the finger at certain players and manager Walter Smith's selection and signing policies.

Burke admits he and his team-mates must prove they are worthy of their wages by rectifying matters on the pitch.

"In any job if you are not doing the right thing, someone else will come in and take your place," the Scotland cap said. "It's as simple as that.

"As a football player you want exceed your own expectations and do as well as you can in each game, and better yourself each season.

"If you're not doing that, especially at a club like Rangers, it's under a magnifying glass and it's very difficult sometimes.

"But you have to be able to cope with the pressure at Rangers and Celtic and if you can't do that then you might have to look elsewhere."