The Brazilian is confident he will be fit for Barcelona's final game of the season against Diego Simeone's men after suffering a foot injury against Real Madrid
The Brazil international suffered metatarsal damage to his left foot in the 2-1 Copa del Rey final defeat to Real Madrid and could face up to four weeks on the sidelines as a result.
Barca host Atletico at Camp Nou on May 17 in the final round of matches in La Liga and Neymar is confident he will be ready to play a part against Diego Simeone's men.
"I knew it would be a long while out, but you've always got that little bit of fear - firstly that you're out injured, which I don't like in any way, and then, of course, over the World Cup. But in three weeks I'll return and I hope to play in Barca's last game," he told Globo.
"It [the injury] was a little swelling which I've had for a while. The most that happened was in that game [the final]. It affected me a bit, it made it difficult to walk even after the game.
"It's horrible to be out, without training, without playing. You watch your team-mates playing, training, and you can do absolutely nothing. Doing nothing is the worst feeling for a player."