"It is still too early to tell. The Italian football did not have much confidence in me, I just need trust. But now I have gained more confidence in myself and I'm more than ready.
"Fighting for something important. I want to compete at a high level, where I'll play to help the team win titles.
"I read many names, but still do not know anything. Everything is in the hands of my agent..."
The Brazilian himself has confirmed Celtic's interest in his signature, telling the Daily Record last month about the respect he has for the club.
He was in great form for Spanish club Elche last season, scoring 12 goals in 35 games for the struggling outfit.
However, 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.
It certainly seems as though Jonathas wants just that. He seems to have no interest in remaining with Pescara who, after failing to win promotion to Serie A, may decide to sell him.
Do Celtic need him?
The Bhoys could certainly do with a new striker. John Guidetti's loan has come to an end and while Leigh Griffiths showed some excellent form toward the end of last season Celtic are likely to need someone to support him a little better than the likes of Stefan Scepovic and Anthony Stokes can.
Jonathas is a potent goalscorer who is clearly up for a move away from his parent club and Celtic are absolutely right to be in the running for his signature.