Toshiba is considering extending the deadline for the second round of bidding for its chip business, as its partner Western Digital continues to object to the sale, sources said Thursday.

Toshiba initially planned to close the bidding on May 19 but is now considering extending the schedule to the end of the month or later, the sources said.

The potential delay in the process of the sale of the chip operation could derail its turnaround efforts, as the sale is crucial to raise cash to make up for huge losses from its U.S. nuclear business.