<p class="big">Brighton have written to the Football Association to discover whether Carlos Tevez was eligible to play in their FA Cup clash with West Ham. </p> The Premier League fined The Hammers £5.5million following a hearing into the transfers of Tevez and Argentine compatriot Javier Mascherano. </p> They ruled that the third-party agreement West Ham had in place contravened Premier League rules. </p> Brighton are not concerned about Tevez's ownership, but have argued that perhaps he was not allowed to play in the FA Cup match in January, which West Ham won 3-0. </p> "We have written to the FA but we haven't had a response yet," Seagulls chief executive Martin Perry told the Evening Argus. </p> "The issue revolves around whether or not he was eligible, it isn't an issue about ownership as far as we are concerned. </p> "It is being investigated now by Fifa, so from our point of view it is a watching brief. We have written for clarification and we will wait and see. </p> "If the Premier League's position is found to be correct, that he was eligible to play and that the rules broken related to ownership, then we don't have a case. </p> "If it was found that he wasn't eligible then we will certainly take it further. It all hinges around that single point." </p>