The 26-year-old is tied with the La Liga side until 2020.
Pardo, a youth product of Sociedad, soon broke into the first-team in 2010.
Having regularly featured for the reserves side, the Spaniard made his debut against Real Madrid.
He has made around 200 appearances for the La Liga side. Pardo also had his short-loan spell with fellow Spanish club Real Betis.
As far this season is concerned, Pardo has played more than 30 matches, scoring 2 goals and provided 2 assists across all competitions.
He was part of the Spanish national team that won the UEFA European U-19 Championship in 2011.
Why should Leeds consider move for Pardo?
The Whites are on the verge of achieving automatic promotion to the Premier League next season.
With that being said, Marcelo Bielsa, the Leeds manager, needs to strengthen his side in every department.
Pardo has the ability to bring a different dimension to the midfield. Normally a central midfielder, he can play either as an attacking midfielder or a box-to-box midfielder, which denotes his versatility.
The Spaniard is well known for his precise long-range passes and technical ability.
Furthermore, he can form a great partnership with his compatriot Pablo Hernandez at Elland Road.
Possibilities of signing
Sociedad are currently having an underwhelming season.
Leeds can easily persuade the Spaniard to Elland Road by ensuring a place in England’s top-flight next season.
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As it stands, the Whites are currently in second place in the Championship table, trailing Norwich City by four points.
They will play Wigan Athletic in their next game.