Antonio had been one of Wednesday's most dangerous performers over a number of seasons, but he was allowed to part in a transfer valued at just £1.5 million by the BBC.
The move was criticised by Wednesday fans at the time and Forest have certainly proven just how much of a bargain it was this season.
The 24-year-old winger has scored 12 goals in his first 40 appearances for the Reds and is one of the leading candidates to win the club's Player of the Season award.
However, with Forest financially struggling and Wednesday having new-found spending power, there could be a chance for the Owls to bring him back to Hillsborough this summer.
Wednesday have been taken over by wealthy Thai businessman Dejphon Chansiri and Stuart Gray has already spoken of his desire to 'shop in a different market' to Sky Sports.
The Owls have been operating under financial constraints for some time, but they appear to have considerable funds available to them and they have already expressed a desire to spend them.
Wednesday were linked with a £12 million move for Jordan Rhodes in the Daily Star and that shows just how much muscle they will have in the transfer window.
That puts them in a position of power and they may wish to make a statement of intent by signing Antonio back from Forest.
The Reds need to raise money to comply with Financial Fair Play regulations and although they would be keen not to lose one of their key players, they may have no choice if the right offer came in.
Forest would likely be looking for around £5 million for Antonio, but Wednesday have the money to afford this sort of price-tag should they wish to sign back the powerful wide-man.
The question mark comes with whether Antonio would be open to rejoining his former club. The powerful attacker has become a fans' favourite at the City Ground and it would certainly be hard to leave for another Championship club.
However, with more money available and an environment he is already familiar with on offer, it wouldn't be beyond the realms of possibility and this is a transfer which may be worth keeping an eye on as the summer transfer window edges closer to opening.