The defender suffered a cut to the head in the win against King’s Lynn Town at the end of last month and had to come off.
He was expected to be in with a chance to face Bromley last weekend but he missed out.
His absence meant that Chesterfield had to play three left-footed centre-backs against the Ravens.
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When asked at Friday’s pre-match press conference if Kerr is going to be available, boss James Rowe said: “Possibly, yes. He came into contact (training) on Tuesday. He had another session yesterday (Thursday) so if there is no setback today in training then he will be available, yes.”
Tomorrow’s opponents Dover are still on minus 12 points and have lost all three of their fixtures so far and Rowe warned it is a ‘banana skin.’
"We thrive on expectation, we want that interest in the club and the team,” he said.
"It is a banana skin, everyone thinks it is going to be a walk in the park – no chance will it be.
"Their manager is very experienced, they have brought in some good loan players from the EFL, they are going to be a challenge and they have scored goals at Altrincham away in their last game.
"Watching the Altrincham game back last week, they were very unlucky to come away with nothing, on the balance of play it was a minimum a draw.
"We have got to make sure we respect them.”