Former British number one Kyle Edmund will miss next month's Battle of the Brits event in Scotland because of continuing issues with his left knee.
Edmund has not played a match since October 2020 having first experienced issues during the 2018 season.
The 26-year-old had surgery in March and was back hitting in early summer but he has not so far been able to return to competitive tennis.
However he still hopes to be fit for January's Australian Open in Melbourne.
His place in the event, organised by Jamie Murray for 21 and 22 December in Aberdeen, will now be taken by Jack Draper.