When Fowler joined City in January 2003, former chairman Peter Ridsdale entered into an agreement with the striker that saw Leeds subsidise his wages.
The club are understood to have contributed in excess of £20k a week to Fowler's salary since he left, an agreement which has already cost them over £3m, and that deal is due to continue until July 1 2006.
Leeds' chief executive officer Shaun Harvey confirmed: "The deal was made with Robbie Fowler when he left to subsidise his wages away from Leeds United. That was a deal which was acceptable to the club at that time. We will re-visit the agreement as a matter of course to establish whether it was specific to Manchester City or to Fowler as an individual."
Chairman Ken Bates revealed in the Post last week that £4.3m is still outstanding to former players and should United continue to pay a portion of Fowler's salary it will cost around £500k before the deal expires during the summer.
Fowler, an £11m buy from Liverpool in November 2001 and who scored 14 goals in 33 appearances during his 14-month stay at Leeds, was one of the first fire sales by the then Leeds board three years ago.
The 30-year-old left at the same time as Lee Bowyer and Jonathan Woodgate, when United's financial problems first hit.
Fowler has signed on a short-term deal with Liverpool that keeps him at Anfield until the end of the season. Liverpool chief executive Rick Parry has revealed Fowler was "desperate" to return to Anfield.