Speaking to the Nottingham Evening Post on Friday, Shirtliff said "The players are playing for their places,"
"It is not rocket science to work out that I can only pick 11 players for any one match and five substitutes - one of which is likely to be a keeper.
"But in the end the team is going to pick itself come the start of the new league season.
"The players who are in the best form after we have completed our friendlies are the ones who will get into the team."
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The Stags sent a various arrray of youth team players mixed in with some 1st team players to Retford on Thursday evening, and went down 3-1.
Mansfield Town:
Gibbons, Rich, Kenarick, Sleath, Buxton, Foster, Arnold, Lloyd, Beardsley, Reet, Boulding.
Subs: Chapman, Jones, Kitchen, Bunning.