"Very sorry to disappoint you, guys. It was not for my girlfriend or my fiancee but for Sachin Tendulkar," he told reporters on Saturday, keeping his promise to reveal the identity of the person after the team reached the final.
His father Yograj Singh had earlier told Reuters that Tendulkar could be Yuvraj's special inspiration.
"Sachin has been a huge influence in his life over the last 11 years or so. He has always been there when Yuvraj was going through a difficult phase in his career," Yograj said.
His son told Times Now channel on Sunday: "What he (Sachin) has given to Indian cricket, nobody has done. I prayed to the almighty that Sachin should win a World Cup before he retires and I'm happy he got it."
After Saturday's final, team mates hoisted Tendulkar on their shoulders and did a victory lap at the Wankhede Stadium.
"All credit goes to Sachin Tendulkar. We played for him," team mate Gautam Gambhir said.
"He has carried the burden of the nation for 21 years so it's time we carried him on our shoulders," batsman Virat Kohli added.