Kolkata Knight Riders are enduring a torrid time in the Indian Premier League (IPL) but skipper Shreyas Iyer on Tuesday expressed optimism for a turnaround, saying the former champions would be "unstoppable as a team" once they get into their groove. KKR have lost five out of eight games, including four on the trot, and are currently placed eighth in the 10-team table. "We got off to a really good start with three wins out of four games but after that things didn't go pretty well for us but I still believe in the team," Iyer told the official website of the team.