The League said Cellino's recent conviction for a tax offence in an Italian court was a "disqualifying condition under its owners' and directors' test".

However, the ruling by the Football League, the governing body for the three English divisions below the elite Premier League, leaves second-tier Leeds facing an uncertain future given Cellino has already put more than �2 million ($3.3m, 2.4m euros) into the Yorkshire club.

The league said the decision was taken at a meeting of their board on Sunday following Cellino's fine for non-payment of Italian duty on a boat imported from the United States.

"Mr Cellino was recently found guilty beyond reasonable doubt by a Court in Sardinia of an offence under Italian tax legislation relating to the non-payment of import duties on a boat," said a Football League statement issued Monday.

"This resulted in a fine of 600,000 euros (�500,800), an order for the payment of trial costs and the confiscation of the boat in question.

"Having fully considered the matter, the board agreed unanimously that the decision of the Italian court does constitute a disqualifying condition under its owners' and directors' test.

"The relevant disqualifying condition being that Massimo Cellino has been convicted of an offence involving acts that would reasonably be considered to be dishonest."

Cellino is entitled to appeal against the league's decision within 14 days.

The statement added: "In such circumstances, the League would seek to expedite the process to deliver certainty to all parties in the shortest possible timeframe."

Last Tuesday, following Cellino's conviction by an Italian court, his lawyer said the verdict was "irrelevant" as far as the takeover was concerned.

"According to my point of view, this business has no relevance whatsoever to the decision of the Football League," Giovanni Cocco told BBC Radio Leeds.

Cellino, the president of Serie A side Cagliari, already had a 2001 conviction for false accounting and is being investigated for alleged misuse of public funds relating to construction work on Cagliari's Quartu Sant'Elena stadium.

Leeds, one of England's leading clubs in the early 1970s, are currently 13th in the second tier Championship and a huge 29 points adrift of automatic promotion to the Premier League.

Under manager Don Revie, Leeds were crowned champions of England in 1969 and 1974, as well as winning the 1972 FA Cup.

They also lost the 1975 European Cup final to German giants Bayern Munich, by which time Revie had become manager of the England national team.

However, in 1982 Leeds were relegated into the old Second Division but re-emerged to win the First Division title again in 1992 -- the final season before the creation of the Premier League.

In 200l Leeds reached the semi-finals of the Champions League but a failure to repeat that success allied to heavy spending prompted the financial collapse of the club and a descent into English football's third tier.

Former Chelsea chairman Ken Bates took charge and Leeds gained promotion to the second-tier Championship, where they have been ever since.

Bates, unpopular with Leeds fans over his perceived lack of investment, was eventually sidelined after a takeover by Middle East-based private equity group Gulf Finace House (GFH) in 2012.

In January this year, it was reported Cellino -- still to complete the takeover but having agreed a deal with GFH to purchase 75 percent of the club's shares -- had sacked Leeds manager Brian McDermott only for United to confirm days later that McDermott remained in post.