England have received International Cricket Council approval to replace the injured Kevin Pietersen with Eoin Morgan in their World Cup squad.
Pietersen, who had been building a new opening partnership with captain Andrew Strauss at the tournament, did not join his team-mates on the journey from Chennai to Chittagong after it was decided he needed to undergo hernia surgery.
The Surrey right-hander has been struggling with the problem for some time but the England hierarchy felt he could play a major part in the competition if it was managed by the medical team.
Those hopes have not been realised and, after bowling eight overs of spin in the dramatic win over his native South Africa on Sunday, Pietersen appeared to labour in the field, leading to a re-evaluation of his condition.
England then asked for permission to draft Morgan back into the side, having previously replaced the Irish-born left-hander with Ravi Bopara due to a broken finger.
Morgan is the second player to be restored to a 15-man squad in the tournament having previously pulled out through injury, following Australia's Mike Hussey.
England team director Andy Flower had earlier welcomed Morgan's return and urged his team to move on quickly from the loss of Pietersen.