Career
Born in West Bengal, Debnath joined Tata FA in 2007 and got graduated in 2010. Mumbai
= 2011-2012 The 2011-2012 football year got off to a good start for Ishan as he made his debut for Mumbai F.C. in the 2011 Indian Federation Cup against Salgaocar. He then made his I-League debut for Mumbai in Mumbai"s 4-0 loss to Dempo South Carolina (U.S.) on October 28, 2011.
Prayag United
Debnath signed for Prayag on 3 June 2012.