Bolt, a six-time Olympic champion, faces a key stage of his fitness recovery when he races for the first time since pulling out of the Jamaican trials with a hamstring strain.
"I'm good, I'm feeling good, been training good now, I'm happy with where I am," Bolt told reporters in London on Thursday.
"My hamstring is good, I have no issue right now. I know I'm in good shape."
The 29-year-old has set his sights on an unprecedented 'triple triple' of Olympic crowns in what will likely be his last Games.
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"I'll definitely be there, I'm excited to go," Bolt said of the Olympics, which get underway in Brazil on August 5.
"This is where history is going to be made, I'm excited to put on a show for the entire world to see. This is my final Olympics, it's a big one."
"I'm definitely a tough competitor," Bolt said. "Last year Gatlin was just not ready, it was the first time he was being chased.
"It was hard for him, but this year is not going to be the same, I am in much better shape, so I won't leave it to the last second.