The 27-year-old has scored seven goals in nine Russian top-flight appearances and continues to attract attention from European clubs.
Recent reports have suggested that Chelsea are one party interested Hulk's services, with Jose Mourinho said to be preparing a January move to bring the striker to Stamford Bridge.
However, the 32-cap Brazil international insists his focus is on helping Zenit in the Champions League knock-out stages and securing a place in a home World Cup next year.
"When this time of the year comes, I pray for protection so that I won't have any serious injury and so that I can keep having success at my work," he told Globo Esporte.
"I hope to keep helping Zenit in the Champions League and in the Russian League in 2014.
"But most of all, I want to help Brazil win the sixth World Cup title we dream of as winning at home is the dream of every player."
Hulk was recently named the second most valuable Brazilian player by Pluri Consiltoria and the striker understands the significat role he plays in the national side under Luis Felipe Scolari.
"That made me very happy, I humbly think this is because of my work. If I were not doing a good job at the national team and at Zenit, I wouldn't be valued this much," he added.
"I had a good season at my team and at the national team, I am important in Scolari's formation."