Delhi has seven Lok Sabha seats and all are held by the Congress at present.
"The party candidates are expected to be announced Tuesday. There may changes on one-two seats," a senior party leader told IANS.
The Bharatiya Janata Party and Aam Aadmi Party have already declared their candidates for Delhi.
Polling in Delhi will take place April 14 and March 22 is the last day of filing nominations.
The Congress has not found it easy to declare candidates in Delhi after the drubbing in the assembly polls last year when it could win only eight seats in 70 member assembly.
Several poll surveys have predicted a dismal showing by the Congress in the capital.