I've never seen anything like this before: substituted goalkeeper refuses to come off. [View all]

Near the end of yesterday's league cup final between Chelsea and Manchester City, with the score at 0-0 and inevitably headed for penalties, the Chelsea manager wants to substitute his keeper and replace him with a presumably better shot stopper, but his keeper absolutely refuses to come off. He stays on, and promptly loses the penalty shootout.

What an outrageous act of insubordination! I've seen players refuse to come on, but never one refusing to come off. How's this even legal?

If I were the Chelsea manager, this keeper would never play for me again, but there are complications: The keeper cost $70 million pounds and the manager is almost certainly on the way out anyway. If the manager resigns instead of being fired, he'd be out the rest of his contract. Still, you can't let this sort of thing go on, can you?