Former finalists Jimmy White and Ali Carter will not be at the Crucible this year after being knocked out in the penultimate round of qualifying for the World Championship.
White, 58, who last appeared at the Crucible in 2006, was beaten 6-1 by Robert Milkins in the third round.
Carter, beaten by Ronnie O’Sullivan in both 2008 and 2012, lost 6-3 to Louis Heathcote on his 41st birthday.
This year’s event starts on 31 July, live on BBC TV, radio and online.
The season-ending tournament was scheduled to take place in April and May but was put back owing to the coronavirus pandemic.
Snooker will be the first indoor event to be played in front of crowds since the coronavirus pandemic, allowing around 300 spectators in for each session.