BornLahir indi [[Lisbon]] of [[Demographics ofketurunan Angola|Angolan descent]],<ref>{{cite news|url=https://tuttosport.com/foto/calcio/golden-boy/2022/07/15-94692027/golden_boy_2022_tutti_i_talenti_ancora_in_gara_foto|title=Golden Boy 2022, tutti i talenti ancora in gara FOTO|trans-title=Golden Boy 2022, all the talents still in the race PHOTO|newspaper=[[Tuttosport]]|language=it|date=15 July 2022|access-date=15 July 2022}}</ref> Tomás camedatang throughmelalui thesistem youth system ofpemuda [[Sporting CP]] after a year at nearby [[G.D. Estoril Praia|Estoril]]. On 25 June 2020, he signed a five-year contract at the former club, with a [[buyout clause]] of €60 million.<ref>{{cite news|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/tiago-tomas-renova-contrato-com-o-sporting|title=Tiago Tomás renova contrato com o Sporting|trans-title=Tiago Tomás renews contract with Sporting|newspaper=[[Record (newspaper)|Record]]|language=pt|date=25 June 2020|access-date=7 July 2020}}</ref> setelah satu tahun didekat [[Estoril]]. Pada 25 Juni 2020, ia menandatangani kontrak berdurasi lima tahun dimantan klubnya, dengan klausul pembelian €60 Juta
Pada 30 Januari 2022, Tomás dipinjamkan ke [[VfB Stuttgart]] Hingga Juni 2023 dengan opsi pembelian.
Tomás made his professional debut on 1 July 2020 one month after his 18th birthday, as an 81st-minute [[Substitute (association football)|substitute]] for [[Matheus Nunes]] in a 2–1 [[Primeira Liga]] win against [[Gil Vicente F.C.|Gil Vicente]] at home.<ref>{{cite news|url=https://www.ojogo.pt/futebol/1a-liga/sporting/noticias/a-reacao-de-tiago-tomas-apos-um-dia-que-ficara-certamente-marcado-toda-a-vida-12378530.html|title=A reação de Tiago Tomás à estreia: "Os que me são próximos sabem..."|trans-title=Tiago Tomás' reaction to the debut: "Those who are close to me know..."|newspaper=[[O Jogo]]|first=Vanda|last=Pinto|language=pt|date=2 July 2020|access-date=7 July 2020}}</ref> He scored his first goal on 24 September, the only one of a home victory over [[Aberdeen F.C.|Aberdeen]] in the [[2020–21 UEFA Europa League|third qualifying round]] of the [[UEFA Europa League]].<ref>{{cite news|url=https://www.pressandjournal.co.uk/fp/sport/football/aberdeen-fc/2518114/fan-view-tiago-tomas-finish-showed-strength-sporting-possess-as-aberdeen-suffer-another-europa-league-near-miss/|title=Fan view: Tiago Tomas' finish showed strength Sporting possess as Aberdeen suffer another Europa League near miss|newspaper=[[The Press and Journal]]|first=Chris|last=Crighton|date=25 September 2020|access-date=29 September 2020}}</ref> He contributed three goals from 30 appearances during [[2020–21 Primeira Liga|the season]], helping his team to conquer the league after 19 years.<ref>{{cite news|url=https://www.record.pt/futebol/futebol-nacional/liga-bwin/sporting/detalhe/um-tt-de-alta-cilindrada-tiago-tomas-ja-bateu-nomes-grandes-do-sporting-e-promete-mais|title=Os rostos do campeão: Um TT de 'alta cilindrada' e que cresce (mesmo) a olhos vistos|trans-title=The faces of the champions: 'High-cylinder' TT (really) growing for everyone to see|newspaper=Record|first=Daniel|last=Monteiro|language=pt|date=11 May 2021|access-date=30 January 2022}}</ref>
Pada 16 Juni 2023, Stuttgart tidak menggunakan pilihannya dan dia pergi, berterima kasih kepada organisasi tersebut karena "mempercayai saya ketika saya tidak ada orang lain yang mempercayainya"
'''VfL Wolfsburg'''
Pada tanggal 5 Juli 2023, Tomás menandatangani kontrak berdurasi empat tahun dengan [[VfL Wolfsburg]] juga dari divisi teratas Jerman.
On 30 January 2022, Tomás was loaned to [[VfB Stuttgart]] until June 2023 with a buying option.<ref>{{cite web|url=https://sport.sky.de/fussball/artikel/vfb-stuttgart-news-tiago-tomas-wechselt-von-sporting-zum-vfb/12529110/33895|title=Mission Klassenerhalt: Stuttgart verstärkt Offensive|trans-title=Mission relegation: Stuttgart strengthen the attack|publisher=[[Sky Sport (Germany)|Sky Sport]]|language=de|date=30 January 2022|access-date=30 January 2022}}</ref> He played his first match in the [[Bundesliga]] six days later, replacing [[Chris Führich]] for the final ten minutes of the 3–2 home loss to [[Eintracht Frankfurt]].<ref>{{cite web|url=https://www.hessenschau.de/sport/fussball/eintracht-frankfurt/eintracht-frankfurt-die-stimmen-zum-sieg-beim-vfb-stuttgart,sge-vfb-reax-100.html|title="Man hat beiden Mannschaften die Nervosität angemerkt"|trans-title="You could tell that both teams were nervous"|publisher=Hessenschau|language=de|date=5 February 2022|access-date=6 February 2022}}</ref><ref>{{cite web|url=https://maisfutebol.iol.pt/alemanha/bundesliga/tiago-tomas-estreia-se-pelo-estugarda-com-derrota-ante-o-eintracht|title=Tiago Tomás estreia-se pelo Estugarda com derrota ante o Eintracht|trans-title=Tiago Tomás makes Stuttgart debut with loss against Eintracht|publisher=Mais Futebol|language=pt|date=5 February 2022|access-date=6 February 2022}}</ref> He scored twice in his next appearance, but was unable to keep his team from a 4–2 defeat at [[Bayer 04 Leverkusen|Bayer Leverkusen]].<ref>{{cite news|url=https://www.spiegel.de/sport/fussball/bundesliga-bayer-leverkusen-ist-das-beste-team-der-rueckrunde-der-vfb-stuttgart-taumelt-a-b81a379d-be81-480b-a3b8-374f57ea9ca4|title=Leverkusen ist das beste Team der Rückrunde, der VfB taumelt|trans-title=Leverkusen are the best team of the second part of the season, VfB fall back|newspaper=[[Der Spiegel]]|language=de|date=12 February 2022|access-date=12 February 2022}}</ref>