Islamabad, July 18 : PML-N supremo Nawaz Sharif, PPP Co-chairperson Asif Ali Zardari and Jamiat Ulema-e-Islam Fazl (JUI-F) chief Maulana Fazlur Rehman spoke over the phone to discuss Pakistan's political situation after PML-N's humiliating defeat in the Punjab by-elections held a day earlier, the media reported. The three leaders have reportedly agreed that a detailed plan of action will be adopted in consultation with other allies, Geo News reported on Monday. According to sources, Nawaz, Zardari and Maulana Fazl reviewed the results of the Punjab by-elections and discussed the future strategy of the coalition government in Punjab and the centre, Geo News reported. In Sunday's Punjab by-polls, the PTI bagged 15 out of the 20 constituencies up for grabs in the province. The clear victory of PTI in the Punjab by-polls has turned around the number game in the Punjab Assembly, with Chaudhry Pervez Elahi now most likely to replace Hamza Shahbaz Sharif as the new chief minister of the province in the coming days. Almost all the politicians who joined the PML-N and voted for Hamza Shahbaz Sharif lost to the PTI candidates. PML-N won four seats and the remaining one seat went to an independent candidate, apart from PTI's 15 seats. Before the by-polls, the PTI and PML-Q had already jointly attained the strength of 173 (163 of PTI and 10 of PML-Q). Now, with 15 additional seats, this strength has reached 188 whereas the figure for the simple majority stands at 186. This means the PTI and PML-Q have crossed that landmark. One independent MPA will likely be part of the new ruling coalition, Geo News reported. /IANS