Olympic champion Ezekiel Kemboi will join Uganda’s Kiprotich in the field of the Haspa Marathon Hamburg on 28 April.
Kemboi, a two-time Olympic and four-time world champion in the 3000m steeplechase, will be making his eagerly-anticipated marathon debut.
Kemboi won the 2004 Summer Olympics, the 2009 World Championships, the 2011 World Championships, the 2012 Summer Olympics, the 2013 World Championships and the 2015 World Championships.
Kiprotich, the 2012 Olympic and 2013 world marathon champion, will return to the northern German port city for the third time, after finishing second in 2017 and fifth one year ago.
The 29-year-old, who is the national record holder at 2:06:33, clocked sub-2:08 performances in both of his Hamburg appearances.
The fastest runner on the start list is Ayele Abshero, who clocked 2:04:23 in his marathon debut at the 2012 Dubai Marathon. The Ethiopian returns after finishing third last year.
World half marathon record holder Joyciline Jepkosgei, who will also be making her marathon debut, and two-time world marathon champion Abel Kirui were previously announced.
The Haspa Marathon Hamburg takes place on April 28 2019.