Djuricic saw United's 3-0 win over Chelsea on Sunday and is trialling with Ole Gunnar Solskjaer's reserve-team.
"Every day, there are more of us here at United," the 16-year-old playmaker told Kurir.
"If we will do well, definitely more Serbs will come to United. Serbian will soon be the official language here!
"Manchester United do not call a player without a reason. People in the club told me not to talk with the press about my stay in Manchester and especially not to mention the conversations."
He added: "I came here with Mr [Budimir] Vujacic [United's scout] and saw Tosic and Vidic. I trained with the second team."
The teenager's father has confirmed that his son is working under Solskjaer with his stint in Manchester due to last until January 18.
"I know Filip will keep his feet on the ground," he said to Sport Serbia. "He will train one or two times per day and yesterday he trained under Ole Gunnar Solskjaer."