"Contours of the alliance are being worked out. So...It is premature for me to say something on the issue till things are finalised," Congress chief spokesman Randeep Surjewala told reporters here.
He said this when asked whether the RLD has been kept out of the tie-up.
Earlier in the day, the Samajwadi Party national vice president Kironmoy Nanda had ruled out any alliance with the Rashtriya Lok Dal (RLD), asserting his party would have a tie-up with Congress only.
The decisions regarding forging an alliance and seats were taken at a marathon six-hour meeting held by Chief Minister and SP chief Akhilesh Yadav with senior party leaders today.
Sources said the RLD wanted more seats than what the SP was ready to part with.
Congress reportedly offered some 20 seats to RLD chief Ajit Singh's son Jayant Choudhary, who is in touch with Congress vice-president Rahul Gandhi.