According to reliable sources, the selection of two more senior players, Muhammad Hafeez and Ahmed Shehzad in the Test squad is also unlikely.
"The selectors, Arthur and the PCB Director of Cricket, Haroon Rasheed recently held a meeting to finalise list of players who will be invited for the training camp for the Sri Lanka series.
"Unfortunately the selectors and Arthur still feel that Umar needs more time to convince them he is ready for a national comeback," a source said.
Even in April before the tour to the West Indies, the enigmatic batsman was not picked after failing a fitness test. His fitness and attitude have been a reason of concern for the PCB, selectors and team management.
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Umar is presently in England training and undergoing a rehabilitation course to not only improve his fitness but also to overcome a knee problem.
The camp which will be set up from August 20 in Lahore is likely to also witness Hafeez and Shehzad restricted to only the ODI and T20 formats as the selectors and the head coach want to give another chance to left-handed opener Shaan Masood in the Tests.
The source said with the retirements of senior batsmen Younis Khan and Misbah-ul-Haq, the selection committee and management is now banking on youngsters Haris Sohail and Usman Salahuddin to fill in their slots in the Test squad.
"They are a couple of other young players the selectors are keeping an eye on like Imam-ul-Haq the nephew of chief selector, Inzamam ul Haq for the camp while it has been decided to also give a try to off-spinner Bilal Asif in Test and ODI formats," the source added.