By Salvador Rodriguez

The first middleweight world champion born in Mexico, Julio Cesar Chavez Jr. (45-0, 31KOs), said the Irishman Andy Lee (28-1, 20KOs), who the Mexican champion will face on June 16 in El Paso, Texas - will be the strongest opponent that he's had in his entire career. If Chavez wins, the 26-year-old boxer is eager to face Argentine star Sergio Martinez (49-2-2, 28KOs) on September 15 in Las Vegas.

"I will have a tough opponent in Lee. I must prepare to reach a level of 100% for this fight, and then I'll be ready by September 15th for my fight against Sergio Martinez - and I will shut his mouth once and for all," Chavez told BoxingScene.com.

"Against Lee, it will be the biggest and strongest fight of my career, because the opponent is left handed and he only has one defeat - so I'll have 12 weeks of training."

Chavez will train in Cancun, Las Vegas and Los Angeles for the fight with Lee.

Another hot topic is Martinez's recent request for Chavez to undergo a random drug testing protocol for their September fight.

"Sergio is not in a position to demand these tests. That's a decision for the Commission of Nevada and World Boxing Council. I am a clean and honest boxer. I prepare very hard for each fight and I do not ingest banned substances. Sergio Martinez can not impose the terms. He wants to fight me just to make money and he hangs on my name," Chavez said.

Chavez will reportedly expect at least $2 million dollars for the fight with Martinez.

Salvador Rodriguez covers boxing for The Record and BoxingScene.com.