The Liverpool striker, expected to vie for a spot with Manchester City's Gabriel Jesus, lined up with Paris Saint-Germain's Neymar and Chelsea's Willian in an open session at Tottenham's training center.
The 26-year-old has been linked with a shock switch to the Spanish top flight in the close-season despite being contracted with the Ligue 1 champions until 2022.
"Physically I am well, my foot is fine".
Neymar has put Manchester City on alert with the revelation that he would like to play for Pep Guardiola, having never had the chance to do so at Barcelona. That will come with time. "Let's take it easy, there are still many days until the opener and I will be 100 per cent then". There are certain difficulties but they shouldn't stop me.
After facing Croatia on Sunday, Brazil play Austria in another friendly seven days later, their final warm-up fixture before opening their World Cup against Switzerland at the Rostov Arena on Sunday, June 17.
"Of course I'm adapting again, but nothing is too serious".
Neymar is now with the Brazil squad stepping up his preparations for the summer's World Cup.
Neymar only signed for PSG last summer when he became the world's most expensive footballer of all time when he left Barcelona for the French capital for £198m.
Neymar still continues his rehabilitation after undergoing surgery on his fractured right foot in March.