West Ham United's new signing Stewart Downing will wear the No23 shirt for the 2013/14 season, as the full list of the Club's squad numbers were revealed on Wednesday.
Fellow summer arrival Andy Carroll takes the No9 shirt, while Razvan Rat is No8 and goalkeeper Adrian No13.
Sam Allardyce's men will wear the numbers for the first time at Saturday's Barclays Premier League opener against Cardiff City.
The other players who have switched numbers are Alou Diarra, who moves from No23 to No18 and Ravel Morrison, who has taken the No15 shirt.
Morrison will have his first name Ravel listed on the back of his shirt, while Razvan Rat's name will appear as R. Rat.
The No6 shirt was retired in honour of Bobby Moore in August 2008.
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The full list of squad numbers is as follows:
1. -
2. Winston Reid
3. George McCartney
4. Kevin Nolan
5. James Tomkins
6. -
7. Matthew Jarvis
8. Razvan Rat
9. Andy Carroll
10. Jack Collison
11. Modibo Maiga
12. Ricardo Vaz Te
13. Adrian
14. Matthew Taylor
15. Ravel Morrison
16. Mark Noble
17. Joey O'Brien
18. Alou Diarra
19. James Collins
20. Guy Demel
21. Mohamed Diame
22. Jussi Jaaskelainen
23. Stewart Downing
24. -
25. -
26. Joe Cole