Early career

Queally began training Brazilian jiu-jitsu at the age of 21, where he eventually achieved his blue belt.^[5]

Queally held an amateur record of 4–1 since the beginning of his Mixed Martial Artist career in 2010. Queally made his professional MMA debut in European based promotion Cage Contenders in 2012 and won via unanimous decision against opponent Kieran O'Donnell. Queally would quickly obtain three decision wins on the regional scene before making the step up to Cage Warriors, where he lost his first fight. Queally fought in South Africa for Extreme Fighting Championship, before fighting in Italy and Poland, where he won both of his fights.^[6]

In 2016 Queally had two bouts in BAMMA, where he went 1-1.^[7]

Fight Nights Global

Then, in 2017 came a series of bouts under the Fight Night Global banner which saw him compete in Russia and Kazakhstan. In his first bout, Queally faced Igor Egorov at Fight Nights Global 64 on April 27, 2017. He won the bout via unanimous decision.^[8]

After losing a close majority decision to Islam Begidov at Fight Nights Global 72, Queally faced Kuat Khamitov at Fight Nights Global 80. After the bout was originally ruled a majority decision win for Kuat, the bout was overturned to a draw by the Russian MMA Union after they decided that Khamitov did no damage with the takedowns and rarely looked like he was in control of Queally at any point. Arguably, Queally did more damage in his defensive positions than Khamitov did looking to secure the Irishman on his back.^[9][10]

His stint in Fight Nights Global culminated in a sensational first-round finish of the then 24-3 Armenian standout David Khachatryan at Fight Nights Global 87: Khachatryan vs. Queally.^[11][12]

After making controversial comments in a post-fight interview comparing Ireland to Allah Peter Queally’s contract with Fight Nights Global was ended in the summer of 2018. ^[13]

Bellator MMA

With a record of 11-4-1, Queally signed with renowned American mixed martial arts promotion Bellator in 2018^[14][15] and lost his Bellator debut against fellow Irish fighter Myles Price at Bellator 217 on February 23, 2019, at the 3Arena Dublin, Ireland.^[16] The fight was labeled as the "biggest fight in Irish MMA history" by fellow coach John Kavanagh due to the pair of fighters having previously trained under Straight Blast Gyms which Myles Price leaving to American Kickboxing Academy in San Jose, California to help current UFC Lightweight Champion Khabib Nurmagomedov spar^[17] in Khabib's scheduled fight against Irish fighter Conor McGregor at UFC 229 on 7 October 2018. The fight ended with a split decision victory for Myles Price.^[18][19]

Queally face Ryan Scope on September 27, 2019, at Bellator 227. Making a come back, Queally defeated Scope via TKO in the second round.^[20][21]

Queally was scheduled to face Brent Primus at Bellator 240. However, Queally was forced to pull out on January 30, 2020, with a LCL tear. He stated that he was ‘absolutely devastated’ to not be featuring at the event.^[22]

Queally faced Patricky Pitbull at Bellator 258 on May 7, 2021.^[23] After Queally caused a cut on Patricky's forehead from an elbow while was on the bottom, the doctor stopped the fight between rounds after the cutman was unable to stop the bleeding.^[24]

Queally rematched against Patricky Pitbull for Bellator 270 on November 5, 2021.^[25] On October 6, 2021, Patricky's younger brother and Bellator MMA Lightweight Champion Patrício Pitbull announced he was vacating the title. Patricky Pitbull vs. Peter Queally was then set to be for the vacant Bellator MMA Lightweight Championship.^[26] Queally lost the bout via second round technical knockout.^[27]

Queally was scheduled to face Kane Mousah on February 25, 2022, at Bellator 275.^[28] However, he was forced to withdraw due to an undisclosed injury.^{[29] [30]}

Queally faced former UFC Lightweight champion Benson Henderson on September 23, 2022, at Bellator Dublin.^[31] He lost the bout via unanimous decision.^[32]

Queally faced Bryce Logan on February 25, 2023, at Bellator 291.^[33] He lost the fight via TKO in the second round.^[34]

Returning to welterweight, Queally faced Daniele Miceli on September 23, 2023 at Bellator 299.^[35] The bout ended in a no contest after an illegal soccer kick in the opening minute of round one rendered Queally unable to continue.^[36]