Karthik had last played a Test match way back in 2010 against Bangladesh but has had a prolific first-class record with 27 hundreds and over 9000 runs.
Saha's batting form in the IPL was woeful with 122 runs in 10 innings at an average of 15.25 but he admitted it was way below his expectation.
If the Bengal keeper fails to recover in time for the one-off historic Test, Dinesh Karthik or Parthiv Patel might get a look in.
Kolkata Knight Riders may be overwhelming favourites to seal a final berth but Saha said the Sunrisers Hyderabad are ready for the challenge in the Qualifier 2 at the Eden Gardens.
Wriddhiman Saha believes that even copybook shots can fetch him runs and there is no need to play unconventional shots.
Saha has earlier opened the batting for Kings XI Punjab and even scored a hundred in a losing cause during the 2013 IPL final against Kolkata Knight Riders.
The Sunrisers Hyderabad wicketkeeper-batsman, Saha praised team-mate Khan after his side's facile five-wicket win over Kolkata Knight Riders on Saturday.
According to reports, Warner might be banned for 12 months by Cricket Australia, which is currently investigating the ball-tampering issue that has plunged the game into crisis.
While being dubbed as a Test specialist, Wriddhiman does have an IPL hundred -- during the 2014 edition in Bengaluru for the Kings XI Punjab.
Sunrisers will face Rajasthan Royals at home two days later to begin their campaign in the 11th edition of the Indian Premier League.
The highly-rated Bengal stumper did his rehabilitation at the National Cricket Academy in Bengaluru after getting injured during India's tour of South Africa, he was seen playing for his office outfit on Tuesday.
Wriddhiman Saha was replaced by Parthiv Patel in the ongoing second Test at Centurion after he picked up the injury, which was initially described as a niggle.
According to reports, Kohli has decided to exclude wicketkeeper Saha from the playing XI that played in Cape Town.
The 33-year-old wicketkeeper surpassed former India captain Mahendra Singh Dhoni, who had claimed nine dismissals in a Test match against Australia at the Melbourne Cricket Ground (MCG) in 2014.
Indian Cricket Team shared some of the pictures from the practice session ahead of the first Test, be held in Cape Town from January 5 to 9.
With 10 days to go before India departs for South Africa for the Test series, Wriddhiman is expecting to recover well in time for the series.
The duo are part of the India Test squad for South Africa tour but the Board has allowed them to represent their state team for the upcoming Ranji semifinal.
Saha said that these bowlers are more unpredictable than pacers Umesh Yadav and Bhuvneshwar Kumar.
Rating Ravichandran Ashwin ahead of others, Saha said the off-spinner posed a big challenge to keep behind the stumps with many variations.
Raman occupied the crease for nearly six hours to help Bengal recover from a jittery 44 for 2 after they were put into bat.
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