The Swans will be able to name an 18-man squad on match days next season after a proposal to have the number of substitutes increased was accepted.
Championship rivals Derby County proposed the idea at the recent Football League AGM and the new rule will come into effect from the start of next season.
Clubs in all three of the Coca-Cola leagues will now be able to name a maximum of seven substitutes, of which three may enter the field of play.
At their Annual General Meeting in Portugal the Football League clubs have also voted to introduce new financial regulations relating to tax payments.
Once necessary practical arrangements have been made, any club that falls behind with its employee related payments to HMRC will be subject to a transfer embargo until such time as the debt is cleared.
Football League chairman, Lord Mawhinney, explained: "It is only right that we do not permit clubs that are unable to meet the costs associated with their existing playing staff to make further new player commitments."
Clubs have also agreed to give the league written permission to monitor, as appropriate, their tax affairs directly with HMRC, who have welcomed this new arrangement.
Lord Mawhinney added: "This new regime will provide us with an early warning system where clubs are facing financial problems.It should also help prevent HMRC debt reaching levels that otherwise could hinder the potential rescue of the club through a CVA.
"More importantly, football generally needs to develop a culture of paying its debts rather than putting them off for another day.This will help our clubs to become more financially sustainable in the longer term."
* Meanwhile the Secretary General of the Football Association of Wales, David Collins, has announced that he will retire from his position on his 65th birthday in January 2010.
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