The 25-year-old says the 2017-18 will be the most important campaign of his career: "I hope it will be a season with a lot of success and a lot of happiness".
Neymar is keen for Paulinho to join him at the Camp Nou and has reportedly been 'lobbying' the Barca hierarchy to complete the deal.
The two-time Asian champions lead the league by a point over Shanghai SIPG and are also due to meet their big-spending rivals in the quarterfinals of the Asian Champions League next month.
Incoming manager Ernesto Valverde has already seen Everton's Gerard Deulofeu added to his side, with defender Jeremy Mathieu among those to depart.
The midfielder spoke to Brazilian televisin Band about Barça's interest: "I'm not a hypocrite - I am a very open person and I do think about Barcelona".
"Paulinho has a once-in-a-lifetime opportunity and we attach great importance to this matter". We can't just let a core player go in the middle of a tough season. "But anything can happen, who knows".
The Brazilian, who spent two years with Spurs, claims Barcelona offered £17.6million for his services, half of the figure included in his release clause.
In May, the Chinese Football Association (CFA), in their latest bid to curb irrational spending and promote homegrown players, announced that they would levy a 100% tax on overseas signings for the summer window.
Barcelona are set to make an offer for Paulinho in the coming days.