Shrewsbury could be affected by the threat of England's friendly victory over Trinidad & Tobago being scrapped.
The game could be wiped from the record books because England used seven subs and a big loser could be hard-up Shrewsbury, who are celebrating a £500,000 windfall after Joe Hart's England debut.
League Two Shrews inserted the clause when the keeper joined Manchester City for £600,000 in 2006.