The Trinidad cricketer has been an important player for the defending champions, but went for runs in while playing against Mumbai Indians on Wednesday.
"I can confirm it's a grade one hamstring strain and he is going to be out for two weeks. It is a big loss. Obviously (he) offers so much balance to the team and his quality as a player... So it is going to cause a little bit of rejigging of the team, but I am sure we will still be able to put together a very strong team," Hussey said.
"And yes it is a big loss for us but we have had these challenges in the past and have been able to overcome them. So let us hope we can do that again," Hussey said at the pre-match press conference.
Hussey also said the team would take a call on who would step in for Bravo, adding that Dhoni and head coach Fleming will be looking at New Zealand's new signing Scott Kuggeleijn, assessing his death bowling skills.
"... yeah definitely I think so, I am sure MS (Dhoni) and (head coach Stephen) Fleming will be looking at Scott and assessing his death bowling skills. Shardul (Thakur) has done a bit of it, Mohit Sharma can bowl at the death. It is about assessing the conditions a bit as well and assessing which bowlers are suited to bowl at the later stages of the game.
"You never know if it is a real turning pitch. I am sure there will be a lot of strategy thinking. It is a key area of the game and we didn't quite get it right against Mumbai."