The thrashing by English batsmen in a T20 International and two ODIs has alarmed the selectors, who were initially not keen on picking Aamir for the showpiece owing to lack of form.
Though Aamir is suspected to be suffering from chicken pox and is to have a medical examination done in London, a reliable source told PTI that the team management, including captain Sarfaraz Ahmed and head coach Mickey Arthur, expressed confidence in the bowler and allowed him time to recover.
He said the team management and chief selector are now awaiting the medical report of Aamir who was sent to London to stay with his in-laws after it first emerged he might have contracted chicken pox.
The lacklustre performance of the bowlers in the matches against England forced the team management to go back to Aamir, who was not part of the 15-man squad named initially.
"They are also keeping a close look at Asif Ali who has scored two successive half-centuries in the ODIs and if he continues his form he might well be included in the World Cup squad but at whose cost this has to be decided," he added.