The record was previously held by his coach, Constantin Gâlcă, who scored five times in a 5–0 victory over FC Brașov in 1994.

It was the first time that a player scored six goals in a Liga I game since 9 June 1993, when Marian Popa of Farul Constanța accomplished the feat in a 6–3 success against Oțelul Galați.

[8] Keșerü then signed a three-year contract in August 2015 with Bulgarian club Ludogorets Razgrad worth €700,000 per annum, becoming the highest-paid player ever for The Eagles.

[13] He scored his maiden goal in the Champions League groups to give a 2–0 lead in the home match against English club Arsenal, but Ludogorets eventually lost by 2–3.

On 28 October 2016, Keșerü scored his first hat-trick for Ludogorets in a league match against Dunav Ruse,[14] a feat that he repeated later in the season against Lokomotiv Gorna Oryahovitsa.

Keșerü went on to score two goals in the second leg home match against FK Žalgiris in the second qualifying round of the 2017–18 UEFA Champions League which Ludogorets won 5–3 on aggregate.

On 7 October 2018, he contributed three goals in a 4–1 away win over Botev Vratsa, thus becoming the foreigner with the most hat-tricks in the A PFG, having managed the feat on five separate occasions.

[15] On 19 September 2019, Keșerü scored three goals in the 5:1 home win against CSKA Moscow in a UEFA Europa League group stage match.

[17] Prior to the 2021–22 season Keșerü lost his status as a first team regular, not being included among the squad members for Ludogorets' second qualifying round match in the Champions League.

[19] After Keșerü terminated his deal with Ludogorets Razgrad, he returned to his native country on 31 August 2021 with Steaua București, now renamed FCSB.

[citation needed] After leaving FCSB, Keșerü signed a two-year contract with fellow Liga I side UTA Arad.

In 2019, Keșerü scored five goals in three games for Romania in matches against Sweden, the Faroe Islands and Norway counting for the UEFA Euro 2020 qualification.