The head coach of the Lawn Tennis Association's National Academy at Loughborough has quit and a recruitment drive to attract suitable replacements has run into difficulties.
Chelsea are braced for a battle to keep hold of highly-rated coach Anthony Barry after Thomas Tuchel agreed a return to management with Bayern Munich.
London Irish have always produced outstanding players: the only issue was keeping hold of them.
Clarke, who was appointed Scotland boss in May 2019, has signed an extension until after the 2026 World Cup campaign.