Celtic have signed Scotland keeper Craig Gordon on a two-year contract, with the option of a further 12 months. The 31-year-old has not featured in a competitive game for more than two years because of a knee injury.

Gordon made his debut for Hearts in 2002 before a £9m move to Sunderland five years later.

During his time with the Black Cats, he twice broke an arm and was recovering from a knee injury when he was released, having played his last match in April 2012.

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