New Delhi, Jun 21 - Uncertainty prevails over the much-talked about expansion-cum-reshuffle of the Union Council of Ministers. The exercise could now take place before the Monsoon session of Parliament beginning August one or after the session is over on September 8, highly-placed sources said. Though Prime Minister Manmohan Singh and Congress President Sonia Gandhi had a meeting last Sunday, the sources said that the consultations over the reshuffle were yet to take place.