Coreau agreed to terms on a one-year, two-way contract with the Islanders on Thursday, CapFriendly reports.
The Blues recalled Coreau from AHL San Antonio on Tuesday.
The Ducks traded Coreau to the Blues in exchange for future considerations Thursday.
The Ducks reassigned Coreau To AHL San Diego on Wednesday.
Coreau was recalled from AHL San Diego on Monday, Elliott Teaford of the O.C. Register reports.
Coreau stopped 18 of 19 shots in Anaheim's 4-1 loss to the Sharks on Tuesday
Coreau will start Tuesday's preseason game versus the Sharks.
Coreau signed a one-year, two-way deal with the Anaheim Ducks on Sunday, Craig Custance of The Athletic reports.
Coreau allowed four goals on 31 shots during Monday's 4-2 loss to Montreal.
Coreau will get the start in Monday's meeting with Montreal, Helene St. James of the Detroit Free Press reports.