[2][3] While playing in Switzerland, Andreu started writing poetry; he is also a fan of books, stating "I have a lot of free time.
I love to read – whether it is thrillers, crime stories or more philosophical themes – and I recently bought a book about French history.
[11] While at Livingston, Andreu met Julia, daughter of then director of football John Collins (who was responsible for signing him) and they entered into a relationship.
[4] He signed a one-year contract with Hamilton Academical on 1 August 2013, having appeared for the club in the Scottish Challenge Cup a few days earlier as a trialist.
[15] He was also selected to the 2013–14 Championship PFA Scotland Team of the Year, alongside Hamilton teammates Ziggy Gordon and Ali Crawford.
[18] After losing 2–0 to Hibernian in the first leg, Andreu scored a last minute goal in a 2–0 win at Easter Road to level the tie on aggregate.
Hamilton won 4–3 in a penalty shoot-out (with Andreu converting the second kick) to relegate Hibernian and achieve promotion to the Premiership.
[23] On 7 January 2016, he returned to Norwich City to fight for his place in the first team, despite Rotherham manager Neil Redfearn's wishes to extend the loan.
[30] During Coventry's 1-0 win against Port Vale on 9 September 2017, Andreu suffered an injury to his anterior cruciate ligament which would rule him out for the rest of the 2017–18 season.