"Afghanistan are the favourites because they have 15 players who play mostly in Europe. There is a huge gap between Asian and European players," Constantine said at the match-eve press conference.
"In fact, after the match against Guam (in 2018 World Cup qualifiers) almost all had raised eyebrows saying how we lose to a country who has a population of 90000 people. But what all did not realise that it was a team comprising of US-based players.
Six-time champions India had lost to Afghanistan 0-2 in the 2013 final in Kathmandu. In the earlier edition in 2011, India had beaten Afghanistan 4-0 at home.
This edition, India have been on a roll having convincingly beaten all their opponents en route to the final but Constantine said the summit clash tomorrow would be a difficult game.
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"It's hard to predict as to which area the match would be decided. It will be decided on all parts of the field. It is going to be a very difficult game. They are a team who can score goals and we need to be careful," he said.
"In football, when you are in control of the game you tend to become a bit sloppy. That's what happened in the semifinal. And if that happens in the final, we will have to pay the price," he said.
Asked if India can beat Afghanistan tomorrow, Constantine said, "They are a very good side. We will fight form the first to the last minute. If we play at our best and they don't have a good day, we can win."
"Sunil (Chhetri) is an important player as is Pritam Kotal, Narayan Das, Arnab Mondal, Augustine Fernandes and all the others including the substitutes," he said.
"One is useless without the other. If Sunil plays well and others don't, he won't get much of the ball. Sunil is a great captain and leader but I never focus on one player."
Afghanistan coach Peter Segrt said that what matters would be to win tomorrow's final and the impressive run in the group stage will have no bearing on it.
He said his players will have to be focused and give their 100 per cent if they want to beat India tomorrow.
"Indian team is very strong. They will make it difficult for us. They have the players to do so and the crowd will be also cheering for them. We will not take them lightly," said the German.