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During his two-year loan spell at Chelsea, Dutch defender Khalid Boulahrouz wore the No.9 shirt despite playing in defence.
Boulahrouz played for the Blues between 2006 and 2008, racking up 23 appearances across all competitions before moving to Stuttgart in 2008.
Boulahrouz struggled to break into the team with John Terry and Ricardo Carvalho picked as first-choice centre-backs, which saw him largely reduced to a bit-part role as a full-back.
Explaining why he opted to use the No.9 shirt, Boulahrouz told FOX Sports, according to Goal: “It was my dream to become a striker for a top team, so I thought ‘maybe I can force it this way’.
“No, I just arrived there and it was all last minute. The competition was already started and it was two days before the game vs Middlesbrough when I signed my contract. One day before the match I was entitled to play.
“I had to pick a number and the kit man from Chelsea started with No. 9. And then he continued with 45, 47… So my thought was ‘I’m not gonna play with a number like that’ so I said ‘Okay, give me No. 9’.”