"It's every player's dream to pursue a career abroad and for me this is a great opportunity to advance my career abroad," Nyandoro told the Sundowns website.
"I have spoken to Peter Ndlovu, who spent the better part of his career in England, and he gave me valuable tips regarding football in the United Kingdom.
"I have also watched Sheffield United in action several on occasions and I have an idea of what to expect.
"I am going to England with an open mind, but with a determination to give it my best shot.
"I am confident that I will succeed because my style of play is suited to the English game," said Nyandoro.
Meanwhile, Udinese midfielder Sulley Muntari has confirmed contact with Bolton Wanderers.
The Ghana international is a £7 million target for Bolton boss Sam Allardyce and told MTNFootball.com: "There are lots of club who have contacted Udinese over my signature and that includes Bolton in England."
Muntari is also a target for Portsmouth boss Harry Redknapp, who made a personal check on the midfielder in yesterday's 3-0 defeat by Brazil.