​Derby defender Eiran Cashin is facing two months on the sidelines with a calf injury.Cashin returned to Pride Park at the start of this month on a loan deal from Brighton for the rest of the season, having started his career at the club and previously playing 144 games.He started in the defeats to West Brom and Birmingham, playing almost the full 90 minutes in both for the Rams, but was absent from their matchday squad against Burnley.”Cash is out now for about eight weeks, he’s done his calf,” manager John Eustace told BBC Radio Derby.Latest Derby County news, analysis and fan views