World half-marathon record holder Sammy Wanjiru of Kenya and US champion Ryan
Hall have been added to the field for this year's Flora London Marathon.
Hall beat a strong field to win the US Olympic trials
The pair will join three-time winner Martin Lel and the world and Olympic champions Luke Kibet and Stefano Baldini for the race on 13 April.
Wanjiru and Hall both made their marathon debuts in 2007.
"We have assembled one of the best ever fields for the race this year," said race director David Bedford.
Wanjiru, who won December's Fukuoka Marathon in his first attempt at the distance, is targetting a time of two hours and five minutes in London as he bids for a place on the Kenyan Olympic team.
Hall is already assured of his place in Beijing having won the US trials in New York in November.
The 25-year-old made his marathon debut in London last year when he finished