New Delhi, Aug 25 - Indian football coach Bob Houghton said that his boys couldn't afford to commit any mistakes against Sri Lanka in their must-win ONGC Nehru Cup football tournament match here Wednesday.

Both teams will be looking for a victory to stay alive in the tournament as each has three points from two games.

A win against Sri Lanka will brighten India's chances of making the final and Houghton is keen on gaining full points from the match.

'We can't afford to make any mistakes against Sri Lanka. We had a good match against Kyrgyzstan but in the last 20 minutes our defence was shaky,' Houghton told reporters after the team's practice session here Tuesday.

Houghton is well aware that the speed of the young Sri Lankan team can trouble India and said that Surkumar Singh will replace Dipak Mondal as the right-back.