Parliament sources said Mahajan faces a tricky situation in view of the fact that AIADMK, Trinamool Congress and BJD are not keen about the idea of sitting next to Congress.
Neither the AIADMK nor the Trinamool Congress and Biju Janata Dal appear to be willing to have seats in Lok Sabha along with Congress, the sources said.
Officials concerned have held several rounds of meeting to sort out the matter and the decision is expected this week.
While discussions for the election of Deputy Speaker are expected to begin this week, reports had it that the post could go to M Thambidurai of AIADMK in the wake of a 'good' meeting party chief and Tamil Nadu Chief Minister Jayalalithaa had with Prime Minister Narendra Modi sometime back.
Talk is that a formula has been evolved under which a party can have a front row seat in proportion to the seats secured by it. If that would be the case, then the Congress would not be able to secure more than two seats in the front row.