Spurs face London rivals Chelsea at Wembley looking to win their first trophy since a 2-1 victory over the Blues in 2008 in the same competition.
Pochettino’s side have played more games than any other Premier League side this season, with Thursday night’s 2-0 Europa League defeat to Fiorentina their 44th fixture.
“Always it is a difficult moment,” the Argentine said. “Players want to play always and in all competitions.
“Every time you pick the starting XI or the squad of 18 it is always difficult to communicate to the players who are not in the squad. But this is football, this is our job and us and the players need to understand always about my decision.
“In each game and every game I take a decision and analyse which is the best side to pick. It’s not a different rule for the final. The players, like on the first day, need to understand that I am the boss.
“I decide the squad, I decide the starting XI and I decide who plays and who does not. It is true that it is a final and an important game but the players need to accept my decision.”
Pochettino is the fourth manager to take control of the north Londoners since Juande Ramos was sacked just eight months after delivering their last piece of silverware.
“No I don’t feel the pressure,” Pochettino said.
“I never feel the pressure from the beginning. In the difficult moments I don’t feel the pressure. For me, the job is to improve the football and get the victory.
“With Daniel, I have a good relationship and he has never put pressure on me to get a trophy or achieve an objective because he knows we are more ambitious than in the short term. Always we play to win.”
Any pressure Pochettino does feel may come in the knowledge that the game will be broadcast live in his home town of Murphy in the Santa Fe province of Argentina – as Tottenham’s popularity in the country continues to be strong.
“Tottenham are famous in Argentina because of Ossie Ardiles and Ricky Villa but there is always interest in the Premier League because it is the best league in the world,” he added.
“Now I am here and (Erik) Lamela is here the interest is bigger. The whole town – 4,000 people will watch the game because all our games are on live in Argentina.”