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India's Mohammad Shami and Sri Lanka's Suranga Lakmal vomited on the field on day four of the third Test, which has been plagued by smog in Delhi.

The Indian city has suffered from smog pollution for several weeks and Sri Lanka fielders have taken to wearing masks at the Feroz Shah Kotla stadium.

Shami and Lakmal walked off the field after both were sick.

Sri Lanka coach Nic Pothas sais his players were in "discomfort" and that Lakmal "didn't feel very well".

Play was halted on three occasions on day two because of the conditions and the issue has continued to affect the match.

"We're professionals, we stopped talking about it, it is not going to make any difference talking about it," said Pothas.

India's cricket board says it will take smog into consideration when scheduling matches at the stadium in future.

The hosts ended day four in a commanding position, with Sri Lanka 31-3 in their second innings but still trailing by 378 runs.