On 11 June 2014, Milla moved to Getafe CF, being assigned to the reserves also in the third level.[2] On 14 January of the following year he played his first match with the main squad, starting in a 1–0 home win against UD Almería, for the campaign's Copa del Rey.[3]
On 20 July 2015, Milla signed a one-year deal with UD Logroñés.[4] On 20 June 2016, after scoring a career-best 18 goals, he joined La Liga side SD Eibar,[5] being loaned to UCAM Murcia CF on 2 August.[6]
Milla scored his first professional goal on 22 April 2017, netting the winner in a 2–1 away success over Girona FC. On 6 July he moved to fellow second division club CD Numancia, on loan for one year.[7]
Ahead of the 2018–19 campaign, Milla returned to the Armeros and was assigned to the first-team. He made his top tier debut on 24 August 2018, starting in a 0–2 away loss against former side Getafe.[8] On 15 June of the following year, after appearing rarely, he signed a contract with Elche CF in the second division.[9]
On 23 August 2020, Milla came off the bench to score Elche's winning goal in the play-offs Final against Girona FC, taking his side back to the top tier after five years.[10] He scored his first goal in the top tier on 18 October, netting the opener in a 2–0 away win over Deportivo Alavés.