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'The biggest challenge for India could be Australia,' said the former off-spinner.
Sanju had scored a match-winning hundred against South Africa in India's last ODI.
The video drew widespread criticism from disability rights advocates, who accused the celebrated cricketers of mocking people with disabilities.
Harbhajan said he finds it difficult to understand why the 33-year-old has not been given a chance in the three-match ODI series against Australia.
Harbhajan observed the Indian players become 'too tight' in high-pressure games and advised them not to worry about the results.
'Mahendra Singh Dhoni is only one. There cannot be a bigger cricketer than him in India,' said Harbhajan Singh.
Venkatesh Prasad has constantly criticised Rahul for his poor run of form which led to a war of words with Aakash Chopra, who tried to defend the right-hander from the former pacer's criticism.
Harbhajan's reaction came at a time when former Indian cricketers Prasad and Aakash Chopra are engaged in a Twitter war over Rahul's place in the team.
Harbhajan joined Sreesanth in a video chat with cricket presenter Vikram Sathaye on Glance LIVE Fest, and revealed how "embarrassed" he felt about the incident.
Sehwag's inclusion in the Test team for the 2007-08 Australia tour for the Border-Gavaskar Trophy surprised many.
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