Roy will probably enjoy playing at ATK under high profile Spanish manager Antonio Lopez Habas, returning for his second spell in charge.
Former Valencia and Celta Vigo manager in la Liga, Bolivia national team manager (two Copa Americas).
Won the ISL title with ATK in 2014
ATK are the Man City of the ISL, famous for splashing the cash.
Continue to benefit from their links to Atletico Madrid (founding part-owner) and Spanish football.
Last September their pre-season was spent in Spain playing local clubs and Fulham.
Habas takes over from former Man Utd legend Steve Coppell who has coached in India for several years.
Coppell took over last season from Robbie Keane (player-manager 2017-18 after taking over from sacked Teddy Sheringham partway through the season). Keane finished his playing career there (6 goals in 9 games)
Jose Molina, now Spanish FA Director of Football, is another former ATK manager (Spain international, Atletico Madrid, Deportivo goalkeeper, Villarreal manager). He won the 2016 ISL title.
Krishna has big shoes to fill in terms of import players (seven allowed on each roster).
He succeeds imports like Keane, Helder Postiga (71 caps Portugal striker, Porto, Spurs, la Liga sides, signed by ATK aged 32), Luis Garcia and Josemi (both members of Liverpool's 2005 Champions League winners), Lanzarote (Espanyol & Zaragoza striker), Sereno (Vitoria Guimaraes & Porto), Gavilan (Valencia & Getafe midfielder), Everton Santos (Brazilian striker ex Corinthians & Figueirense, Paris Saint-Germain), Borja (Real Madrid and Valladolid midfielder who juggled playing for ATK at the same time as playing for Valladolid and Eibar in la Liga)
Actually Borja's example shows how a player can successfully alternate playing in the short Indian IPL season with other leagues.
Krishna could even do that.