The former Sevilla man is hopeful that the gifted midfielder can develop into an important first-team member at the Santiago Bernabeu.
The 27-year-old joined Madrid from Tottenham at the start of the 2012-13 campaign, but has so far been struggling to live up to the high expectations his price tag put upon him.
Nevertheless, Modric played an important role in Madrid's 2-1 Champions League win over Manchester United on Tuesday, and Suker is hopeful that the midfielder can build on his recent success.
"I hope that he can continue to show that he has the qualities to become an important player for Madrid. The match against United showed that he can lead the team in big games," Suker told Marca.
"I am very happy for him that he put in a good game. He has always worked hard without complaining. This will be a big confidence boost for him. He showed everybody what he's capable of. Modric is a fantastic player and he proved his worth at a big moment."
Modric has made 36 official appearances for Real Madrid so far, netting two goals.