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| Transferred from OB Odense, Denmark on 6/8/1998 for £500, 000 |
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| Sunderland: | 1998-1999 | Played | 45 | Scored | 0 | goals | (Division 1) |
| | 1999-2000 | Played | 37 | Scored | 0 | goals | (Premiership) |
| | 2000-2001 | Played | 34 | Scored | 0 | goals | (Premiership) |
| | 2001-2002 | Played | 34 | Scored | 0 | goals | (Premiership) |
| | 2002-2003 | Played | 21 | Scored | 0 | goals | (Premiership) |
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| Transferred to Aston Villa on 8/8/2003 for £2, 225, 000. |
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| (Thomas is pictured above during the 1-0 defeat against Leicester City on 3/11/2001) |