Olympic champion Jessica Ennis-Hill will begin the build-up to Rio 2016 by competing in Loughborough on Sunday.
The 30-year-old is making a comeback from injury after an Achilles problem forced her to miss the World Indoor Championships in March.
Ennis-Hill, who won heptathlon gold at London 2012, will throw the javelin in her first outdoor competition of the season at the Loughborough International Athletics match.
The world champion pulled out of June's meeting in Gotzis and is not yet ready for a full heptathlon, although she has already secured her place in Rio.
She said: "I am going to start off my outdoor season with a javelin competition at the Loughborough International to put a marker down for us to work with.
"It is a firm favourite of both my coach and mine as the timing is always good, and the local support is amazing."
European Champion James Dasaolu will compete over 100m while European gold and silver medallists Martyn Rooney and Matthew Hudson-Smith will race in the relay.
Also running over 100m are Dwain Chambers and Harry Aikines-Aryeetey.
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