CINCINNATI - Receiver Chad Johnson agreed to a five-year extension Wednesday night with the Cincinnati Bengals, who have grown accustomed to his big catches and his boasts.

Johnson, a second-round draft pick in 2001, approached the club about an extension in recent weeks. He was under contract through next season, and the extension will take him through 2009.

''I'm here for five,'' said Johnson, who was at Miami of Ohio's football game in nearby Oxford when the extension was announced. ''I'm going to try to make it another five after that. I started here, let's finish here.''

In his third season, Johnson has developed into one of the NFL's top receivers and one of its top talkers. He leads the AFC in receiving with 807 yards.

He has gotten nearly as much attention for his boasts. Twice last season, he guaranteed wins - he ended up 1-for-2. He also stunned teammates this week by guaranteeing that the Bengals (4-5) will beat the Kansas City Chiefs on Sunday.

The contract extension was the highlight of a week in the spotlight.

''And I've got to finish it off with a bang Sunday,'' he said.

Johnson emerged as the Bengals' top receiver last season, when they finished a franchise-worst 2-14. When Marvin Lewis arrived as head coach, Johnson decided he wanted to stay.

''When Marvin got here, it was a done deal,'' Johnson said. ''I'm happy. It's like the feeling you have when your baby is born, being there seeing it. It's kind of the same feeling. I'm really glad.''