Dhawan was on 31 at the time when his catch was dropped and the opener went on to score 190 off 168 deliveries.
"It is hard to appreciate bowlers' effort after you concede 400 runs in a day. India are a very strong side. We dropped a catch of Dhawan and then paid a price. Not sure what would have happened had that catch been taken," said the manager at the press conference.
"It was a double blow. We dropped the catch and lost a player," said Gurusinha.
"It's sad. He will undergo a surgery in a short while. Most probably he will be out for a minimum of four weeks. We will know in the next 48 hours about the time frame. He has fractured his thumb in three places. As soon as we saw the x- rays we knew it was very serious and we rushed him to Colombo," the manager added.
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"We know Dhawan wasn't in the initial squad but then he came back into the side and showed the selectors what he is capable of. It was a good track for him and we also ended up bowling to his strength, and he capitalised on that," said Gurusinha.
However, Gurusinha expressed confidence that his batsmen could still turn the game around with a good show.
"They will recall the manner in which Lanka beat India turning around a similarly dominant performance from the visitors on day one of the series back in 2015. You never know. This is Galle and after scoring 600 runs you can still lose a Test match.
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