With parent club Manchester City last month rejecting an $11 million approach from a Championship side for the Huddersfield loanee, the midfielder's dynamic form and Guardiola's endorsement has provoked a new wave of interest.
The World Game can reveal that a flurry of enquiries followed almost immediately when Guardiola said of Mooy - in the build up to the Terrier's goalies FA Cup draw with City this weekend - "He's playing amazing this season, so we are glad of that."
The Spaniard, who is strongly considering including Mooy in City's first team squad next season, added: "it's not easy coming from Australia to the Championship and playing as good as he is."
Sources in England suggest that the director of football at one Premier League team placed Mooy in the $30 million bracket as he weighed making an offer.
Other top flight clubs have also taken heed, along with the Championship's more cashed up clubs, and it looks highly likely Mooy will be a Premier League player next season. It's just a question of by what route.
Mooy was forced to sit out City's fifth round clash with Huddersfield at the John Smith's Stadium, ruled ineligible under the terms of his season-long loan. The same will apply for the replay.
Should City decide to cash in on a player they picked up for a token fee from satellite side Melbourne City, the transaction would dwarf the previous highest transfer fee paid for an Australian - the $10.05 million Leeds shelled out to Celtic for Mark Viduka in 2001.
The only uncertainty, assuming the Socceroos star maintains the form which has helped Huddersfield move to within touching distance of an automatic promotion spot, is whether Mooy stays and plays for City, is sold on to an existing EPL side or goes up with a Huddersfield, and is signed by them.
Mooy's Australian-based agent Paddy Dominguez declined to comment when approached over the latest speculation over Mooy's future.