Ander Herrera is part of a probe into alleged match-fixing and illegal payments in Spain.
According to Spanish reports, prosecutors will next week file court papers naming the player as part of their investigation.
The Spanish international will be required to fly over and give evidence at the court in Valencia.
If found guilty he could face a ban or even jail time. The allegation is tied to Herrera’s time at his first club, Real Zaragoza.
The 25-year-old was part of the Zaragoza team that won 2-1 against Levante on the final day of the 2010-11 season in a must-win game to seal the club’s escape from relegation.
A subsequent investigation by Spanish anti-corruption authorities has reportedly recovered payments to players’ bank accounts –including that of Herrera-with former Zaragoza president Agapito Iglesias’ role under the microscope, as well as that of two club directors.
The papers are expected to be presented in Valencia, accusing all 28 players who took the field for the match on May 21, 2011 – including Swansea’s Jefferson Montero –of being part of the alleged fix.
Three players who did not take the field are also implicated, crucially including reserve keeper Antonio Doblas, the evidence against whom the prosecution considers to be damning.