Late into 2011, Hervías renewed his contract until 2016.[2] He played his first competitive game with the first team on 19 April 2014, coming on as a late substitute for Chory Castro in a 2–1 La Liga home win against RCD Espanyol.[3]
Hervías scored his first goal for the Txuriurdin's main squad on 20 October 2014: again after having replaced Castro, he put the hosts ahead in the 82nd minute of a league home fixture against Getafe CF, but in an eventual 2–1 loss.[4] On 8 May of the following year, he was loaned to Segunda División strugglers CA Osasuna until June, as a replacement to injured Jordan Lotiès;[5] he found the net in his first appearance, helping his team to a 2–0 home victory over CD Mirandés after replacing Karim Ansarifard.[6]
On 25 July 2015, Hervías renewed his contract until 2018,[7] and moved to second division club Real Oviedo on 3 August, on loan for one year.[8] On 10 August of the following year, he joined Elche CF of the same league also in a temporary deal.[9]
Eibar
Hervías signed with SD Eibar on 5 July 2017,[10] moving on loan to Real Valladolid seven days later.[11] After helping the latter in their top-flight promotion he returned to his parent club, but rejoined Valladolid on loan on 23 January 2019.[12]
Valladolid
On 14 May 2019, Hervías was permanently signed by Valladolid as they remained in the top tier for the following campaign.[13] He scored his first goal in the competition on 15 September, in a 1–1 home draw with Osasuna.[14]
Málaga
On 12 August 2022, Hervías joined Málaga CF on a one-year deal.[15]