Pochettino played with Brnovic - a former Partizan player - with Espanyol for six years, and is quoted on the Tottenham website talking about the test that his side faces.
He said: “We all know that they are a very good team who play with a good philosophy and we expect a tough game.
“They are top of the Serbian league and they have a lot of talent, lots of good players.
“The first game is always important, important to try and get the three points, a good performance and to feel good on the pitch.”
He told Sky Sports: "Younes has history at Tottenham and has the respect of all teammates. But I think we want all the players to show leadership on the pitch and in the changing room. We have a lot of players who can be the captain but Younes Kaboul was the captain in America in my first game and we are very happy with him."
Benjamin Stambouli, a midfielder signed from Montpellier in the summer, is hoping to show what he can do in the Europa League this evening.
He told the Tottenham website: “It’s a chance to show what I can do and there are many games, so we need everyone.
“We have targets and we are together to reach these targets. When you think collectively, you are strong.”