The Brazilian has been sidelined since January after picking up a metatarsal injury against Strasbourg in a French Cup tie.
"He has been working hard, with a good mindset. We could get him back as soon as Sunday," Tuchel told Sky Sports.
On Friday, the 27-year-old posted a photo of himself in training with the caption: "I'm feeling good."
I’m feeling good 🤪 pic.twitter.com/Q2Ly8eL2d9— Neymar Jr (@neymarjr) April 19, 2019