Does the length of an interconnect degrade the sou

It really depends on the player but 10 meters is pushing it for most players. If it's digital output you are using, you can probably do it with high quality coax, balanced or optical as long as you have a decent DAC at the other end. If it's analog, the output stage of the player is critical as is the quality of the cables. It can be done.

What player is it? What are the options?

The only real difference in susceptibility to noise pickup and that depends on the RF/EMI environment which is quite noisy in studios. I run 30foot interconnects from preamp to amp and there's no consistent difference between balanced and unbalanced with regard to noise or signal attenuation.

If the source can drive the line and the load for the length, it's fine.