The sheikh "will meet today with the royal family and advisors," the Qatar-based Al-Jazeera television news channel reported yesterday, stressing that the meeting would take place in the context of a possible succession.
Diplomats and Qatari officials agree that the emir is preparing to hand over control of the oil-rich emirate, which plays a key role in the Arab world.
Sheikh Tamim, born in 1980, is the second son of the emir and his second wife Sheikha Mozah.
The crown prince is joint commander of the armed forces and head of the country's Olympic committee.
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"The emir is convinced that he should encourage the new generation. He plans to transfer power to the crown prince, Sheikh Tamim, and to carry out a ministerial reshuffle to bring a large number of young people into the cabinet," a Qatari official told AFP on condition of anonymity.
Qatar took part in the armed intervention in Libya and is actively supporting the rebel forces in Syria.
"The emir could take a step back, that is to say not retire completely but play a more honorary role, so that his son can better assume the responsibilities and become the man in charge," a French diplomat said.