Coventry City manager Andy Thorn felt his side have a lot of work to do in all departments after Tuesday night's 4-1 defeat at Wrexham.
Speaking to the CT's Alan Poole after the game, Thorn said: "It's better we go through this now than when the season starts for real.
"You don't really learn too much when you are beating teams 8-0 and 5-0 but Wrexham are a battle hardened side; we knew they would give us a real test which is why I wanted to play them and it's proved we have got a hell of a lot of work to do in all departments.
"We can't afford to defend like that and expect to come away with a result from any game.
"I know it's a new back four but it's stll difficult to expain because that was nothing like I see in training every day.
"We've got to get it right first and foremost so we have got two weeks of really hard graft ahead of us."
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