12. Sol Campbell
Tim Hales/AP/Press Association ImagesAnother big name player Celtic fans are probably pleased they avoided, Campbell was also on the agenda as a free transfer for Neil Lennon as he attempted to bring in some experience to his depleted Celtic defence. At the time, 35 year old Campbell had actually just impressed with Arsenal in a short second spell and had travelled to Parkhead to try and push through a deal. His short but decent spell with Arsenal was actually just about enough to make us all ignore his age at the time, and his embarrassing debacle with Notts County. The move was never meant to be, however, as Campbell opted to join Newcastle. The club didn't mind that he snubbed them in the end, as his Newcastle career turned out to be extremely uninspiring as he scarcely gained any starts or earned much praise from the Toon fans. He then retired in 2012 after he was released by Alan Pardew in 2011 after a full year of failing to find a club that wanted him.