Paul Warne has revealed the difficulties Derby County may have this summer following promotion to the Championship. Derby achieved automatic promotion to the Championship on Saturday afternoon with a 2-0 win over Carlisle United. Paul Warne is now faced with a busy summer ahead as 12 of his players see their contracts expire and most positions in his squad need bolstering with added quality. The 50-year-old doesn’t boast the best record in the second tier, having suffered relegations at Rotherham United in 2017, 2019 and 2021. During his time at the Millers however, Warne wasn’t backed by as t…