Alejandro Sabella, the coach who took Argentina to the World Cup final in 2014, has died aged 66 after years of battling with cancer and heart problems.
Sabella's death came less than two weeks after the passing of Diego Maradona, who played with Sabella for the Argentine national side in the 1980s.
Maradona died from a heart attack in Buenos Aires on Nov. 25, aged 60. Just a day later, Sabella was hospitalised as he was "very affected" by the ex-Napoli forward's passing.
The hospital where Sabella had spent the last couple of weeks said he died from the consequences of a "secondary dilated cardiomyopathy and long time cardiotoxicity."
"It was a pleasure to share so much with you," Messi wrote on Instagram. "Alejandro was a great person besides being an impressive professional that left a mark on my career and I learned a lot from.
"We lived together some of the best football memories during the qualification for the World Cup and the World Cup."
Meanwhile, Manchester City forward Sergio Aguero also said: "I'm very sad about this. For me and for everyone else Sabella was more than a coach. He gave us a lot of confidence. In the World Cup qualifiers and especially at the 2014 World Cup, we needed that confidence to build a good group and he was key to create a strong group.
"From that strong group we made a great team. That was key for us to compete at the highest level and put Argentina where it belonged. He trusted me and I was very grateful for that."
Saballa's former teammate Ubaldo Fillol said: "Another harsh blow for football in this dark 2020: the beloved Alejandro Sabella has departed. An exquisite player, a winning coach who took us to the World Cup final, and a great person."
A tricky winger who also played in midfield, Sabella shot to fame at River Plate in the 1970s and earned a transfer to Sheffield United, becoming one of the first South American players to feature in the English league.
His time at Sheffield United was short but Sabella was, along with international teammates Osvaldo Ardiles, Ricardo Villa and Alberto Tarantini, one of several Argentines whose arrival in the UK after their 1978 World Cup triumph brought a touch of glamour to the English game.
His two years in Sheffield were followed by a short spell at Leeds United before he returned to Estudiantes in 1982.
It was at the Argentine club that he became a manager in 2009, leading the provincial side with Juan Sebastian Veron in midfield to their fourth Copa Libertadores title.
Sabella's success there led to a position as coach of the national team in 2011.
After losing 1-0 to Germany after extra time in the World Cup final in Rio de Janeiro, Sabella retired and, increasingly beset by health problems, never returned to the sidelines.