Olympic 100m champion Maurice Greene will not be competing at the World Indoor Athletics Championships in Lisbon.

Greene told reporters he wants to concentrate on the outdoor World Championships in Edmonton, Canada, in the summer instead.

He also said he aims to lower his 100m world record of 9.79secs.

"I tell you I'm not going," he said. "I haven't even brought my passport here with me."

"My aim this year is to defend my 100m and 200m titles at the World Championships."

The news will be a disappointment to organisers of the championships in Lisbon.

On Friday at the US Indoor Championships in Atlanta, Greene equalled his 60m world record of 6.39secs in the semi-finals before going on to take the title.

Greene's coach, John Smith, said: "That told us Maurice is in shape to break his outdoor mark."

Greene, however, was unimpressed. "I came here to break my record - not tie it.

"In my semi I slowed down with the last couple of strides.

"I regret that now. I don't know why I did it. If I hadn't, I would have run 6.37secs."

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US team for Indoor World Championships:

Men
60m -Tim Harden, Tim Montgomery
200m - Kevin Little, Shawn Crawford
400m - James Davis, Milton Campbell
800m - Trinity Gray, Elliott Gaskins
1,500m - Seneca Lassiter, Jason Lunn
3,000m - Tim Broe, Brad Hauser
60m hurdles - Terrence Trammell, Tony Dees
High jump - Nathan Leeper, Charles Austin
Long jump - Melvin Lister, Kevin Dilworth
Pole vault - Lawrence Johnson, Tye Harvey
Shot put - Adam Nelson, John Godina
Triple jump - Kenta Bell
Heptathlon - Chris Huffins, Stephen Moore
4x400m - James Davis, Milton Campbell, Jerome Young, Leonard Byrd

Women
60m - Chryste Gaines, Angela Williams
200m - LaTasha Jenkins, Kelli White
400m - Suziann Reid, Monique Hennagan
800m - Jearl Miles-Clark, Jennifer Toomey
1,500m - Collette Liss, Miesha Marzell
3,000m - Regina Jacobs, Cheri Kenah
60m hurdles - Anjanette Kirkland, Bisa Grant
High jump - Amy Acuff
Pole vault - Stacy Dragila, Kellie Suttle
Long jump - Dawn Burrell
Triple jump - Tiombe Hurd
Shot put - Connie Price-Smith
4x400m - Suziann Reid, Monique Hennagan, Tasha Downing, Donna Howard