Martinez's men are on the brink of European qualification, though it remains to be seen if they will be playing in the Champions League or Europa League next season.
The manager accepts that with several key men set to leave - Romelu Lukaku, Gerard Deulofeu, Gareth Barry and Lacina Traore were all loaned to Goodison Park this season - he intends to have a busy summer.
"It's not about improving - it's about increasing," Martinez said. "When you're playing in Europe you need to have another six or seven and that's the reality and we will do that - it's not an issue.
"Every summer is busy. We signed 10 players in the previous two windows and that's what you expect from window to window.
"I never worry about losing players. It's the opposite - I get excited about bringing new players in. You need fresh blood.
"We've got incredible senior players at this club. You've got Tim Howard, Phil Jagielka, Leighton Baines, Leon Osman, James McCarthy - those players hold the dressing room together.
"(But) we need fresh talent. Fresh additions help the team."