Jose Mourinho has been summoned to appear in a Madrid court on Nov. 3 -- two days before he takes his Manchester United side to his old team Chelsea in the Premier League.
The Spanish authorities opened a case against the 54-year-old in June for alleged tax evasion during his time as Real Madrid boss.
It is claimed he did not declare revenue related to his image rights in 2011 and 2012 and owes the Spanish state nearly £2.9 million.
Mourinho's agent issued a statement at the time that denied this allegation and pointed out he paid nearly £23m in taxes during his stint in Spain, at an average tax rate of more than 41 percent.
It also stated that he had reached a settlement agreement with the Spanish taxman in 2013.
The case against the charismatic but controversial Portuguese is part of a wider crackdown by the Spanish authorities against tax fraud and several leading figures in football have been caught out.
Argentine stars Angel Di Maria, Javier Mascherano and Lionel Messi have all been convicted of tax evasion in recent years, while Neymar's transfer to Barcelona was the subject of a major investigation and Cristiano Ronaldo is also currently fighting alleged tax fraud charges.