Seam bowler Malinga was forced to withdraw from the global tournament after dislocating his shoulder during the second T20I against England last week.
He clutched his non-bowling shoulder after releasing the delivery, fell to the floor during his follow-through, and after a scan was ruled out.
Madushan has only played eight T20Is since making his debut in 2022, taking 12 wickets at an economy-rate of just more that eight runs to the over.
After the clash against Ireland in Colombo on Sunday, co-hosts Sri Lanka have further group matches against Oman, Australia, and Zimbabwe in a bid to qualify for the Super Eights.
Proteas pace spearhead Kagiso Rabada believes some pitches at the T20 World Cup will be of assistance to the bowlers even though high scores are being predicted at the global tournament.
India allrounder Harshit Rana is a major doubt for their T20 World Cup opening clash against USA in Mumbai on Saturday after suffering a thigh injury.
Australia have suffered another fast bowling casualty on the eve of the T20 World Cup after Josh Hazlewood withdrew from the global tournament due to an Achilles injury.
Former India international Ravichandran Ashwin has backed New Zealand to outperform Australia at the 2026 T20 World Cup, despite neither Trans-Tasman rival entering the tournament in ideal form.
