He also ruled out an alliance with any party, even as he said that the Congress President would decide on the chief ministerial face for the Assembly polls and no "deal" has been struck with new entrant Navjot Singh Sidhu.
"Congress will win the elections on its own. We will get clear majority," he told reporters here.
He said his decision to contest from Lambi "was motivated by his desire to save the people of Punjab from the Badals".
Dismissing Kejriwal's charge as ludicrous, Amarinder said, "First he said I should fight Badal and now he says I'm helping the chief minister by contesting against him."
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He also challenged the Delhi CM to take on Badal from Lambi. "Kejriwal will know his position and where he stands," he said.
Asked if Sidhu would be offered an important post if the party wins the assembly polls, Amarinder said "There is no deal with Navjot Sidhu, Congress doesn't do deals with anybody."
Asked if he would be the CM candidate, Amarinder said, "I don't know, that is Congress President's decision."
"The entire campaign is being handled by me and then you are asking me this question," he added in a lighter vein.
Sidhu's role, and his own, would be decided by the Congress high command, said Amarinder, adding that he and the cricketer-turned-politician would be campaigning for the party through a joint road show in Amritsar on January 19.
He reiterated that Sidhu would be a star campaigner for the Congress in the Punjab polls.
He cited his strong Patiala connection with Sidhu, whom he said he had known since he was a kid, to make it clear that there was no tension between him and the ex-cricketer, who had joined the Congress unconditionally.
Amarinder also said the former BJP MP himself had stated that he was a "born Congressman".
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Responding to a wide range of questions from mediapersons before setting out to file his nomination papers from Patiala, Amarinder asserted that both Patiala and Lambi were important constituencies for him and a decision on which one he would quit, if he won both, would be taken at an appropriate time.
In response to a question, Amarinder said his wife and sitting MLA Preneet Kaur, who had made way for him in the assembly polls under the 'one-family-one-ticket' rule, would be contesting in the parliamentary elections.
The PCC chief also dismissed any serious threat from former Army chief General J J Singh, who has been pitted against him in Patiala.
"Having been a army chief...And then made governor by the UPA, he is now claiming to have been upset by Operation Bluestar," he said.
On the SYL issue, Amarinder asserted that if Congress was voted to power in Punjab, it would bring a new legislation to protect the water rights of Punjab and make sure that not even a single drop of water left the state.