Sprinter CJ Ujah has pulled out of the British squad for the World Athletics Championships with a back injury.

The 25-year-old helped the 4x100m relay squad to gold two years ago and was again a member of the group selected for Doha.

He tweeted: "My team and I know this is the right step to get myself healthy for 2020 and beyond."

Harry Aikines-Aryeetey, who anchored the British quartet to the European title in 2018, has replaced Ujah.

• Asher-Smith to go for Worlds double

Great Britain squad:

MEN

100m: Ojie Edoburun, Adam Gemili, Zharnel Hughes

200m: Miguel Francis, Adam Gemili, Zharnel Hughes

400m: Matthew Hudson-Smith, Rabah Yousif

800m: Elliot Giles, Kyle Langford, Jamie Webb

1500m: Neil Gourley, Josh Kerr, Jake Wightman

5,000m: Andrew Butchart, Ben Connor, Marc Scott

3,000m Steeplechase: Zak Seddon

110m Hurdles: Andrew Pozzi

400m Hurdles: Chris McAlister

Pole Vault: Harry Coppell

Triple Jump: Ben Williams

Hammer: Nick Miller

Decathlon: Tim Duckworth

Marathon: Callum Hawkins

20km Race Walk: Tom Bosworth, Callum Wilkinson

50km Race Walk: Cameron Corbishley, Dominic King

4x100m Relay: Ojie Edoburun, Miguel Francis, Adam Gemili, Zharnel Hughes, Richard Kilty, Nethaneel Mitchell-Blake, Harry Aikines-Aryeetey

4x400m Relay: Cameron Chalmers, Dwayne Cowan, Toby Harries, Matthew Hudson-Smith, Martyn Rooney, Lee Thompson, Rabah Yousif

WOMEN

100m: Dina Asher-Smith, Daryll Neita, Asha Philip

200m: Dina Asher-Smith, Beth Dobbin, Jodie Williams

400m: Emily Diamond, Laviai Nielsen

800m: Alexandra Bell, Shelayna Oskan-Clarke, Lynsey Sharp

1500m: Sarah McDonald, Laura Muir, Jemma Reekie

5,000m: Jessica Judd, Eilish McColgan, Laura Weightman

10,000m: Eilish McColgan, Steph Twell

3,000m Steeplechase: Elizabeth Bird, Rosie Clarke, Aimee Pratt

100m Hurdles: Cindy Ofili

400m Hurdles: Meghan Beesley, Jessica Turner

High Jump: Morgan Lake

Pole Vault: Holly Bradshaw

Long Jump: Abigail Irozuru, Shara Proctor

Shot Put: Sophie McKinna

Heptathlon: Katarina Johnson-Thompson

Marathon: Tish Jones, Charlotte Purdue

4x100m Relay: Dina Asher-Smith, Kristal Awuah, Imani-Lara Lansiquot, Daryll Neita, Ashleigh Nelson, Asha Philip

4x400m Relay: Finette Agyapong, Amy Allcock, Zoey Clark, Emily Diamond, Beth Dobbin, Laviai Nielsen, Jessica Turner, Jodie Williams