Rubuta ci gaba don wannan sakin layi - A ranar 30 ga Maris, 2004, Chhetri ya buga wasan farko a tawagar 'yan wasan Indiya ta U-20 a nasarar da ta samu a kan' yan wasan Pakistan U-23 a wasannin SAF na 2004
a kasar Pakistan. A ranar 3 ga Afrilu 2004, Chhetri ya ci kwallaye biyu don tawagar 'yan wasan Indiya U-20 da Bhutan U-23 a nasarar da suka samu na 4-1. A ranar 12 ga Yuni 2005 Sunil ya zira kwallaye na farko don manyan 'yan wasan kwallon kafa na Indiya da Pakistan.