Donieber Alexander Marangon (born 22 October 1979), known as Doni, is a Brazilian former professional footballer who played as a goalkeeper.

[6] With Roma, Doni at first was blocked from first team action by Italian u-21 international Gianluca Curci and was restricted to UEFA Cup games.

[citation needed] On 11 April 2007, Doni conceded seven goals in a UEFA Champions League tie against Manchester United, with the game ending 7–1.

[13] In the 2009–10 season, the club continued to use Artur and then Júlio Sérgio as first-choice goalkeeper, despite employed Claudio Ranieri to replace Luciano Spalletti.

[citation needed] Doni made his Premier League debut for Liverpool on 7 April 2012 in a 1–1 draw against Aston Villa at Anfield.

[22] Although he was still included in Liverpool's squad for the 2012–13 season, Due to this personal leave he missed a chance to start while first choice goalkeeper Pepe Reina was injured; Brad Jones played instead.

[citation needed] It was finally announced, upon leaving Liverpool, that Doni had suffered a heart attack during a routine medical in the summer of 2012.

[citation needed] At the 2007 Copa América, he was selected as Brazil's first-choice goalkeeper moments before their first match against Mexico, replacing Helton.

[citation needed] He was included in the preliminary squad for the 2008 Summer Olympics, but eventually did not get a place in the final list by coach Dunga.

As a result Roma benched him for the remainder of the Italian season, but coach Dunga appreciated his loyalty and, as a reward, kept his name in all subsequent callings.