Lahir di [[Córdoba, Argentina]], Zelarayán dijuluki " El Chino " (Pria Tionghoa) sejak kecil dan tetap menggunakan julukan itu selama kariernya.<ref name=":0"/><ref>{{cite news |title=MLS: el Chino Zelarayán llegó a los 30 goles en Columbus Crew |url=https://www.ole.com.ar/futbol-internacional/america/golazo-zelarayan-columbus-crew-montreal_0_AtdgRR7sdz.html |access-date=18 November 2023 |work=Olé |date=10 September 2022 |language=Spanish}}</ref><ref>{{cite news |title=Video: doblete de golazos del "Chino" Zelarayán jugando para Armenia |url=https://www.cadena3.com/noticia/futbol/video-doblete-de-golazos-del-chino-zelarayan-jugando-para-armenia_361022 |access-date=18 November 2023 |publisher=Cadena 3 |date=16 Juni 2023 |language=Spanish}}</ref> Ia bermain sepak bola muda di Las Estrellas, [[Club Universitario de Córdoba|Universitario]], dan Atalaya, dan merupakan lulusan muda [[Club Atlético Belgrano|Belgrano]]. Ia melakukan debut seniornya pada 25 April 2012, masuk sebagai [[pemain pengganti]] babak kedua untuk [[Lucas Parodi]] dalam kekalahan tandang 2-1 melawan [[Rosario Central]], untuk [[Copa Argentina]] musim ini.<ref name=":0">{{Cite web |last=Villalobo |first=Marcos |date=2015-09-08 |title=Lucas Zelarayán, un Chino de sangre celeste |url=https://www.elgrafico.com.ar/articulo/1089/8509/lucas-zelarayan-un-chino-de-sangre-celeste |url-status=live |archive-url=https://web.archive.org/web/20220316212851/https://www.elgrafico.com.ar/articulo/1089/8509/lucas-zelarayan-un-chino-de-sangre-celeste |archive-date=16-03-2022 |access-date=26-6-2023 |website=El Gráfico |language=es}}</ref>
Zelarayán mademelakukan hisdebutnya di [[ArgentineDivisi PrimeraUtama DivisiónArgentina|Primera División]] debut onpada 2 MarchMaret 2013, replacingmenggantikan [[Jorge Velázquez]] indalam akekalahan 2–0tandang away2-0 lossmelawan against [[Newell's Old Boys]].<ref>{{cite web|url=http://espndeportes.espn.com/futbol/cronica/_/id/361066|title=Scocco abrió el camino para el triunfo de Newells ante Belgrano|trans-title=Scocco cleared the path to Newells' triumph against Belgrano|publisher=[[ESPN Deportes]]|language=es|date=2 Maret 2013|access-date=30 December 2017}}</ref> HisGol firstprofesional professionalpertamanya goalterjadi came onpada 7 April oftahun the following yearberikutnya, assaat heia scoredmencetak thegol winnerkemenangan indalam akekalahan 2–1kandang home defeat2-1 ofatas [[Club Atlético River Plate|River Plate]].<ref name=":0" /><ref>{{cite web|url=http://espndeportes.espn.com/futbol/reporte?leagueCup=ARG.1&id=386434|title=Belgrano venció a River y lo dejó sin la punta|trans-title=Belgrano defeated River and left them without the leadership|publisher=ESPN Deportes|language=es|date=7 April 2014|access-date=30 Desember 2017}}</ref>
OnPada tanggal 5 DecemberDesember 2014, aftersetelah becomingmenjadi apemain regular starterinti, Zelarayán extended hismemperpanjang contractkontraknya untilhingga 2018.<ref>{{Cite web |date=12 April 2014 |title=El ¨Chino¨ es de Belgrano|url=https://www.belgranocordoba.com/noticia-belgrano/684/ |url-status=live |archive-url=https://web.archive.org/web/20230410213440/https://www.belgranocordoba.com/noticia-belgrano/684/ |archive-date=10 April 2023 |access-date=10 April 2023 |website=www.belgranocordoba.com}}</ref>
OnPada tanggal 5 DecemberDesember 2015, amiddi transfertengah speculationspekulasi transfer, Zelarayán playedmemainkan hispertandingan lastterakhirnya game foruntuk Belgrano, versusmelawan [[Club Atlético Colón|Colón]] indi theLiga [[2015 Argentine Primera División|Liguilla Pre Sudamericana]]Pra-Amerika, wheredi hemana wasia givendiberi theban captain'skapten armbanddan andperpisahan anyang emotionalmengharukan farewelloleh bypara the fanspenggemar. OverLebih dari 55,.000 spectators chantedpenonton hismeneriakkan namenamanya insecara unisonserempak tountuk bidmengucapkan himselamat farewelltinggal.<ref>{{Cite web |title=¨Olé, olé, olé, olé, Chino, Chino...¨|url=https://www.belgranocordoba.com/noticia-belgrano/1344/ |access-date=15 Mei 2023 |website=www.belgranocordoba.com}}</ref><ref name=":1">{{Cite web |last=Lee |first=Jimmy |date=2020-06-05 |title=Lucas Zelarayán: The Kid From Humble Beginnings Who Became an Idol for his Beloved Club (Interview) |url=https://golazoargentino.com/2020/06/05/lucas-zelarayan-the-kid-from-humble-beginnings-who-became-an-idol-for-his-beloved-club/ |url-status=live |archive-url=https://web.archive.org/web/20230626043324/https://golazoargentino.com/2020/06/05/lucas-zelarayan-the-kid-from-humble-beginnings-who-became-an-idol-for-his-beloved-club/ |archive-date=26-06-2023 |access-date=26-06-2023 |website=golazo argentino }}</ref>