Michael Duff hopes to make the most of Clarke Carlisle's misfortune and re-establish himself in Burnley's starting line-up.[LNB] Duff suffered a calf strain just 30 minutes into the new season at home to Nottingham Forest and was replaced by Carlisle, who has since excelled in the centre of defence.[LNB]But Carlisle was harshly dismissed just seven minutes into Saturday's trip to Millwall, which meant Duff was thrust back into action.[LNB]Despite battling with cramp during the closing stages, the Northern Ireland international helped 10-man Burnley claim a 1-1 draw and hopes to cement a starting role during Carlisle's absence.[LNB]"This is what you wait for," Duff told the club's official website.[LNB]"It's disappointing when it's someone else's misfortune but that's how it works.[LNB]"Clarkey has taken his opportunity well when I got injured and this is what a squad and competition is all about.[LNB]"Clarkey might be suspended for three games now so hopefully I will get in the team and kick on from there again."[LNB]Burnley have appealed against Carlisle's red card, although his ban could be extended if the appeal is unsuccessful.[LNB]Duff, 32, is set to start at Sheffield United after the international break but insists there is a friendly rivalry with Carlisle.[LNB]"Me and Clarkey had a laugh about my situation," he added. "I think I've said before he told me he was the one who shot me from the stand.[LNB]"He came on after 30 minutes against Forest and, to be fair to Clarkey, he has been one of our best players since he cane back and I had to wish him well.[LNB]"You don't wish anybody bad luck or misfortune but I've had an opportunity now. I thought I did okay and hopefully I will get a chance in the next game."