Question: What is the commonly known name of a German football player who provided the inspiration for a nickname of Flávio Sérgio Viana?

Context paragraphs:
Mário Sérgio Pontes de Paiva: Mário Sérgio Pontes de Paiva, more commonly known as Mário Sérgio (7 September 1950 – 28 November 2016), was a Brazilian footballer and manager, who later became a commentator for Fox Sports Brazil, which he joined at the channel's inception in 2012.  He died in the LaMia Airlines Flight 2933 accident in the Colombian village of Cerro Gordo, La Unión, Antioquia, while travelling with the Chapecoense football squad for the Copa Sudamericana finals on 28 November 2016.

Flávio Sérgio Viana: Flavio Sergio Viana known as Schumacher (born in São Paulo, August 31, 1975) is a Brazilian futsal player.  He was elected as the 2008 World's Best Futsal Player.  His nickname is a reference to German football goalkeeper Harald Schumacher.

Flávio Igor: Flávio Igor Rodrigues Silva Pereira Ferreira, known as Flávio Igor (born 10 February 1984) is a Portuguese football player who plays for Sousense.

Paulo Sérgio da Silva: Paulo Sérgio da Silva, known as Paulo Sérgio (born 2 December 1972) is a former Brazilian football player.

Paulo Sérgio (footballer, born 1969): Paulo Sérgio Silvestre do Nascimento (born 2 June 1969), commonly known as Paulo Sérgio is a Brazilian former footballer who played as a forward.  Whilst at German club Bayern Munich, he won the Champions League in 2001, despite missing his penalty in the final shootout.

Sérgio Lomba: Sérgio Miguel Lopes Lomba Costa (born 11 August 1973), better known as Sérgio Lomba, is a Mozambican retired professional football player who played as a defender.  Lomba is best known for his stints in the Primeira Liga with Gil Vicente and Moreirense.

Esporte Clube Viana: Esporte Clube Viana, commonly known as Viana, is a Brazilian football club based in Viana, Maranhão state.  They competed in the Série C twice.

Harald Schumacher: Harald Anton Schumacher (born 6 March 1954 in Düren, West Germany), commonly known as Toni Schumacher, is a German former football goalkeeper, and a member of the Germany national football team.  He won the 1980 European Championship and lost two World Cup finals, in 1982 and 1986.  In the 1982 FIFA World Cup semifinal against France, he collided with and seriously injured French defender Patrick Battiston.  Since April 2012, he serves as vice president at 1.  FC Köln.

Werner Krämer: Werner Krämer (23 January 1940 – 12 February 2010) was a German football player, who is a household name to the West German football audience under his nickname "Eia Krämer".  He was born in Duisburg, Germany.

Denis Viana da Silva: Denis Viana da Silva or more commonly "Denis Silva" (born 3 September 1986 in Cubatão, São Paulo) is a Brazilian football player.  He currently plays for Thai League T1 side Sisaket as a defender.

Supporting paragraphs: Flávio Sérgio Viana Harald Schumacher
Answer: Toni Schumacher