With Guardiola, he's reached the top level and right now he's one of the best [defenders] in the world.
With less than one month until the showpiece tournament commences in Russian Federation, the Paris Saint-Germain forward wants to prove his fitness in a bid to regain his form from earlier in the year.
Having been sidelined since February, Neymar said he was slowly nearing a return.
He added that "it is OK that he went the way he did, he won an important title here, he won the Champions League, won the Spanish league".
And the Argentine admitted seeing his former team-mate at Madrid would be a huge blow.
"It's a very hard time, I think it's the most hard I have had because we are so close to my dream, the World Cup".
Millions of Muslims prepare for start of fasting in Ramadan
An Iraqi woman shops at a store in the central holy city of Najaf, a day before the start of the holy Muslim month of Ramadan. Fasting in the month of Ramadan, one of the five pillars of Islam, is a compulsory religious obligation on all adult Muslims.
Neymar refused to give any insight as to where he would be playing his football next season after picking up Ligue 1's Player of the Year award on Sunday evening.
Lionel Messi has now reacted to the rumours of Neymar moving to the Bernabeu and he's given his honest opinion on the situation by saying it would "tough" to accept.
Last summer's world record signing from Barcelona has not featured for PSG since, but is expected to be fit for his country's World Cup warm-up with Croatia on 3 June.
Sao Paulo: Brazilian striker Neymar said getting fit for the World Cup following surgery has been the biggest challenge of his career and he is also anxious about how his injured foot will respond to top-class competition.
Should he end up joining Real, Neymar will follow in the controversial footsteps of countryman Ronaldo and Luis Figo.