Cristiano Ronaldo has hailed Manchester United legend Sir Alex Ferguson as his "great friend".Ferguson signed Ronaldo for the Red Devils from Sporting Lisbon in 2003 with the Portuguese star going on to star for Real Madrid and Juventus.He has been linked with a move back to Old Trafford this summer following a difficult season in Serie A with Juve.It remains to be seen where Ronaldo's future lies but he will always remember what Fergie did for him at United.The legendary manager has a documentary released on his life this week, with Ronaldo taking to Instagram to praise his former boss.Showing a promo for the documentary, Ronaldo wrote alongside it: "Sir Alex Ferguson: Never Give In is a film all about my great friend!"Ronaldo has often.
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