Though his injury is not serious, the Delhi boy has been advised complete rest by the doctors.
The Nehru Cup team hasn't been announced but Sushil Singh is expected to take his place.
Chhetri's injury has come as a big blow for India's title defence of the Nehru Cup. Chief coach Bob Houghton has already said that at the age of 32, ace striker and national captain Bhaichung Bhutia cannot play for 90 minutes in each and every match.
And in Chhetri's absence, it would be tough for Houghton to get a best attacking pair for India.
Chhetri, who earlier went for trails at Coventry City, has attracted the attention of Scottish giants Celtic FC. During the camp in Bareclona, some of the talent scouts of Celtic closely followed Chhetri's performance.
The India team will assemble here on August 11 for the Nehru Cup starting from August 18.