He said India lost the match because they brought pressure on themselves and it was just a matter of winning one match to get the team rolling.
In an extraordinary twist in Galle, India capitulated to an embarrassing 63-run defeat against the islanders, who scripted one of the most remarkable turnarounds in recent Test history.
Asked if the team was under pressure, the former captain responded in negative.
"It was not a question of buckling under pressure. They sensed the pitch could deteriorate. The pressure was brought on. My general feeling is that if they can get one (victory) on the board it will be the start of many," he said, stressing on the need to have one good win under their belt.
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"They go out with intent. The endeavour of this team is to play fearless cricket that comes with mindset. These boys have enough talent, I an sure they must have thought after the match why I didn't play this shot, why I didn't play in this manner."
Skipper Virat Kohli's handling of three spinners and the bowling changes in the match have come under the scanner but Shastri threw his weight behind the captain.
It was a dramatic performance from the hosts who came back from the dead after conceding a massive 192-run first innings lead to turn the table on the Indians who had themselves to blame for the debacle. This meant centurions Kohli, Shikhar Dhawan and Ashwin's (10-wicket match haul) efforts wentn in vain.