Atletico Madrid manager Diego Simeone inadvertently told a woman about the death of her husband on Twitter.
Simeone revealed his "pain" at the death of his friend and journalist Jorge 'El Topo' Lopez who was killed in a car crash in Sao Paolo ahead of Argentina's World Cup semi-final against Holland.
Simeone included Lopez's wife, Veronica Brunati, in the tweet who seemed to be unaware of the news.
"He was not only a great journalist, but was also a friend. Much pain. My condolences to @verobrunati and family. RIP Jorge 'Topo' Lopez," the manager said.
No sólo se fue un gran periodista, se fue también un amigo. Mucho dolor. Mis condolencias a @verobrunati y familia. DEP Jorge "Topo" López.
Brunati quickly replied: "No. Diego, don't tell me that. Please someone call me."
@simeone Diego no me digas eso
@simeone por favor alguien que me llame estoy en un hotel en san pablo en el quality
The 38-year-old was killed on Wednesday after the taxi he was travelling in was hit by a stolen car fleeing police in Guarulhos, near Sao Paolo.
Speaking after messages of support came flooding in, Ms Brunati said: "Thank you to all for the support for me and my children. The man of my life was the love of my life - I have no comfort.
"He gave everything for journalism. It was his passion; his profession; His true love. I just wanted to make him happy."
Lionel Messi dedicated Argentina's win in the semi-final to Lopez on his Instagram page.
Writing on Facebook and Instagram, the Barcelona star said: "Big hug to all the Argentina fans and a very special memory for Jorge 'Topo' Lopez.
"This victory is especially for you, my friend. A big hug to the family, lots of strength."
The Argentinian football association also paid tribute to Lopez on its Twitter page, sending its "heartfelt" condolences to his wife Veronica, their children and his colleagues at Radio La Red and Ole Sports.
Lopez is the second journalist from Argentina to die in a road collision within a week, following the death of Maria Fernandez.