Osmar Loss

Osmar Loss Vieira (born 3 July 1975), or simply Osmar, is a Brazilian professional football manager who is currently the head coach of Thai League 1 club Buriram United.

Osmar Loss

Osmar with Persepolis in 2024
Personal information
Full name	Osmar Loss Vieira
Date of birth	(1975-07-03) 3 July 1975 (age 50)
Place of birth	Passo Fundo, Brazil
Team information
Current team	Buriram United (head coach)
Managerial career
Years	Team
1994–2009	Internacional (youth)
2010	Juventude
2010–2011	Internacional (youth)
2011	Fluminense (youth)
2011–2013	Internacional (youth)
2011	Internacional (interim)
2012	Internacional (interim)
2013–2015	Corinthians U20
2015	Bragantino
2015–2017	Corinthians U20
2017–2018	Corinthians (assistant)
2018	Corinthians
2019	Guarani
2019	Vitória
2020–2021	Internacional (assistant)
2021	Internacional (interim)
2022	Cianorte
2022–2024	Persepolis (assistant)
2024	Persepolis
2024–	Buriram United

Career

Born in Passo Fundo, Rio Grande do Sul, Loss began his career with Internacional's youth setup in 1994.^[1] On 6 July 2009, he was appointed manager of the B-side.^[2]

On 23 December 2009, Loss was appointed manager of Juventude,^[3] being sacked the following 16 August.^[4] After another spell back at Inter and Fluminense's youth setups, he was named at the helm of the former's reserves for the second time.

On 18 July 2011, Loss was appointed interim manager of the main squad, replacing sacked Paulo Roberto Falcão;^[5] his reign lasted until 12 August 2011, and he returned to the B-team.^[6] On 20 November of the following year, he was again interim, in the place of dismissed Fernandão.^[7] He returned to his previous duties on 12 December, after the appointment of Dunga.

On 17 September 2013, after being demoted to the under-20 squad by Dunga, Loss joined Corinthians and was named manager of the under-20 side.^[8] On 17 April 2015, he was appointed at the helm of Bragantino, after a partnership with Corinthians was established;^[9] his reign lasted nearly three months, and he subsequently returned to Corinthians and its under-20 squad.^[10]

On 30 January 2017, after winning the year's Copa São Paulo de Futebol Júnior, Loss was appointed Fábio Carille's assistant at the main squad.^[11] On 22 May 2018, he replaced Carille as a first team manager.^[12]

On 5 September 2018, after a 2–1 defeat to Ceará, Loss was demoted back to his previous role as an assistant.^[13] On 28 November, he was named manager of Série B side Guarani for the upcoming season.^[14]

Persepolis

On 22 July 2022, Loss joined Persepolis as assistant coach.^[15][16] On 27 January 2024, Loss was named Persepolis head coach, replacing Iranian Yahya Golmohammadi.^[17][18]

Managerial statistics

As of match played 20 August 2025

Managerial record by team and tenure

Team	Nat	From	To	Record
				P	W	D	L	Win %
Juventude		23 December 2009	16 August 2010	22	2	9	11	009.09
Internacional		18 July 2011	12 August 2011	12	3	6	3	025.00
Bragantino		20 April 2015	9 July 2015	12	4	1	7	033.33
Corinthians		23 May 2018	5 September 2018	25	10	5	10	040.00
Guarani		28 November 2018	21 March 2019	13	4	2	7	030.77
Vitoria		21 May 2019	4 August 2019	10	2	2	6	020.00
Internacional (Caretaker)		11 June 2021	22 June 2021	2	1	0	1	050.00
Cianorte		9 June 2022	25 July 2022	6	2	1	3	033.33
Persepolis		27 January 2024	12 June 2024	17	13	3	1	076.47
Buriram United		26 June 2024	Present	63	42	13	8	066.67
Total				182	83	42	57	045.60

Honours

Manager

Persepolis

• Persian Gulf Pro League: 2023–24

Buriram United

• Thai League 1: 2024–25
• Thai FA Cup: 2024–25
• Thai League Cup: 2024–25
• ASEAN Club Championship: 2024–25

Individual

• Thai League 1 Coach of the Month: August 2024
• Thai League 1 Coach of the Year: 2024–25