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Kerala are likely to stick with the combination of two pacers and three spinners.
The Kerala Ranji captain says his side is placed in a tough group and it's important to take it one game at a time.
The visitors were 236/6 at stumps on day two in reply to Kerala's first innings total of 239.
Kerala ended the opening day on 237/7 against Bengal.
Kerala, who declared their first innings on 525/9, reduced Delhi to 23/2 at stumps on the second day.
Chandela (125) and Rana (114) kept the Kerala bowlers at bay for close to 30 overs. The two added 118 runs for the third wicket.
It was sweet revenge for Bengal who had suffered a shock defeat at the hands of Kerala last season on an Eden Gardens green top.
The former India opener is now just 853 runs away from completing 20,000 runs in first class cricket.
Rahul and Jalaj Saxena provided a solid start for Kerala by adding 68 for the opening wicket. Saxena (32) was dismissed by Tejas Baroka.
The visitors, who were shot out for 142 in their first innings, ended the penultimate day on 142/1. They still trail Kerala by 241 runs.
Results 341-350 of 376