Bath have been hit by a mass of injuries this season and combined with a number of their players unavailable due to the World Cup in Australia, they now find themselves in dire straits.
Mike Catt, Iain Balshaw, Mike Tindall, Kevin Maggs and Simon Danielli all away on World Cup duty, while Brendon Daniel, Alex Crockett, Jamie Williams, Lee Best, Spencer Davey, Tim Brasher and Chris Malone all currently sidelined due to injury.
London Wasps winger Paul Sampson has already joined the club earlier in the week on a three-week deal to help alleviate the injury worries.
"We have an injury problem in the backs," said Bath Rugby's Director of Rugby, Jack Rowell. "So we're looking at ways to solve that problem.
"Paul [Sampson] joined earlier in the week and now Wylie has come in. As I stated before, it would be too much of a leap in standard for our Academy boys to be suddenly thrust into the Zurich Premiership, whereas Wylie is a class winger of proven ability."
Human, who has played Super 12 rugby for the Cats, Bulls and Sharks, joins former Springbok and Western Province centre Robbie Fleck at the club, with the latter making an early debut last week after a request from the club.
The 24-year-old Human will be available for selection for the team's match against Gloucester at Kingsholm on Saturday.