The 23-year-old most recently had a loan spell at ADO Den Haag.
The former Stoke and Aston Villa midfielder joined Joey Barton’s side in January.
Some teams prospered when the action resumed, while others could not get in the groove.
Griffiths came off the bench around the hour mark for his first taste of pre-season action having reported back out of shape after the lockdown.
Changes could be on the way next season.
Kettlewell was able to field two different line-ups against Livingston and Celtic.
Jose Mourinho has opened the door for Jan Vertonghen to return to Spurs one day.
The Toffees finished 12th in the Premier League.
Deposed Premier League champions may play a friendly match as they focus on the Champions League.
Saints finished the season in 11th and were one of the stars of ‘Project Restart’.