India, Aug. 29 -- Pakistan opener Imam-ul-Haq has sustained a low-grade calf strain, putting his participation in the remainder of the second Test against England in doubt, the Pakistan Cricket Board said on Friday.

Imam suffered the injury on the opening day of the Test and spent time off the field during Thursday's evening session.

"Scans later confirmed a low-grade calf strain and Imam is currently receiving treatment under the supervision of the Pakistan medical team," the PCB said in a statement.

"His participation in the remainder of the Test depends on treatment leading to recovery," it added.

Imam had opened the batting with young Azan Awais in the first Test at Leeds, which Pakistan lost by an innings inside three days.

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