The sold out Kassam Stadium which watched United’s 3-2 win will have given a five-figure boost to the coffers in what is already a profitable run.
Even before ticket sales are taken into account the club have netted £185,500 in prize money and broadcast fees from the three rounds.
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Appleton was asked after the Swansea game how he planned to use the extra revenue, but the head coach’s first thought was on whether his January fund could be increased further.
He said: “I want to do a deal first on the next round before deciding how we spend it.
“We’ve been tracking a number of players, but January is a window where if you do business you want to effect your XI, not necessarily the 18.
“We want to bring in players who are either better or as good as we’ve got.
“To do anything else would be silly because of the position we’re in.”
If the agreement can be extended it could come at a critical time, with the fourth round ties taking place on the weekend before the transfer window closes.