The Priestfield Stadium promises to be a lively place this Saturday afternoon after Gillingham sold out of home tickets. Cardiff had already taken up the full away allocation and now the match is a complete sell out.
Priestfield holds around 11,000 and it could be a nervy day for both sets of fans.
Victory for either side will be enough to secure a place in this division for next season, defeat for Gillingham will make them sweat into the last game away at Forest whatever way the other results go. Defeat for City would be OK if Crewe or Brighton lose.
With both sides needing that win to make sure it's going to be a cracker.