The decision on deputy chief minister would be taken by the party National president and vice president at an "appropriate time", he said.
"Sidhu's decision to join the Congress was unconditional. No strings attached," the former Punjab chief minister said.
He said Sidhu would be the party's candidate from Amritsar East, as announced by his wife Navjot Kaur Sidhu.
On the delay in the announcing remaining candidates for the Punjab polls, he said it would be announced today.
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Ruling out tickets for "outsiders", he said they may get ticket where Congress does not have its own "strong candidates".
Reacting sharply on Arvind Kejriwal being virtually declared AAP's chief ministerial candidate yesterday, Amarinder said "the Delhi Chief Minister's gameplan had been completely exposed and it was clear he wanted to become the chief minister of Punjab without even contesting the polls".
Kejriwal, who hails from Haryana, had earlier in the day clarified that his party's chief ministerial candidate for Punjab would be someone from the state.
Rejecting Akali Dal and AAP criticism of the Congress manifesto, Amarinder said it had the stamp of approval of world-renowned economist and former prime minister Manmohan Singh.
It had been prepared by former Punjab finance minister Manpreet Badal and former state deputy chief minister Rajinder Kaur Bhattal and is a perfect document, he added.
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