England are sweating on the fitness of bowlers Stuart Broad and Graham Onions ahead of the two-Test series against Bangladesh.
Team director Andy Flower, who is already without James Anderson and Ryan Sidebottom, should find out the results of scans on Friday after Broad and Onions both picked up back problems.
Tim Bresnan has been asked to stay on as cover for the remainder of the tour.
Flower revealed: "We have concerns over Broad, who injured something in his back in the second ODI, and Onions, who is also struggling with something in his back," he said.
"Both of them are having MRI scans today and we will know more about their results in the afternoon."