"Sinha is known for expressing free-wheeling (uninhibited) opinion over current issues which is a healthy tradition," Kumar said praising the actor-turned BJP leader.
On the possibility of the BJP leaders's joining JD(U), the chief minister said, "he (Sinha) has not given any signal that he is no more a part of BJP."
"He is in BJP so it will not be proper for me to answer your question of Sinha joining JD(U)," he added.
Sinha, who has been sulking after denial of role in new election team of Narendra Modi, embarrassed BJP recently by describing Nitish Kumar as "PM material."
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The comment came as an embarrassment for the saffron party, which is gunning for Kumar's head after the split in NDA.
Some party leaders were so angry that they demanded the party to crack whip on the Lok Sabha member from Patna Saheb.
Sinha had also met the Bihar CM. Though both of them described the meeting as a "social one", the timing of meeting and mutual admiration the two expressed for each other left BJP high and dry.