As recently as last week the Brazilian himself spoke to the Daily Record about Celtic, stating:
“I know all about Celtic, how big they are in Europe, how respected they are and about their fans.
“And they win their league, which means they are consistently qualifying for the Champions League."
Jonathas is only on loan at Elche, so any negotiations will have to be carried out with his parent club Pescara of Italy.
But the former Brazilian youth international, who scored 15 goals in 37 games for Latina on loan last season, is certainly a natural in front of goal and Celtic would be on to a winner if they can convince Pescara to part ways with the 26-year-old.
However, it now looks as though they have some serious competition for his services from a Champions League quarter-finalist.
It is reported by Spanish paper Diario AS that Monaco are also interested in the player.
The Ligue 1 side, who made it to the final eight of the Champions League this season, are looking for potential replacements for Dimitar Berbatov - whose contract expires this summer.
The report claims that he will cost around €5.5 million and that is money Monaco, who look set to be shot of Radamel Falcao as well this summer, can certainly afford.
Jonathas is known to want Champions League football, so a lot will depend on where Monaco finish in Ligue 1. They are currently in a three way battle for the top four with Marseille and Saint-Etienne.
Celtic need a new striker with John Guidetti set to leave the club in the summer when his loan deal from Manchester City ends. Jonathas is the perfect option. However, it now looks as though they have stern competition for his signature.