Lazio president Claudio Lotito is pleased with their new transfer policy.
The Rome club are on track to qualify for next season's Champions League.
"We are signing up young players who over the years can increase the value of our club. The examples clear for all to see are Keita Balde Diao and Felipe Anderson.
"There were people here before me who would spend 90m on Gaizka Mendieta without ascertaining the real quality of the player. These things never happened with me.
"When it came to players, I always made choices. They must provide morality and economic compatibility."