The Reds will meet the Norwegian side in a pre-season friendly at Intility Arena on 31 July, as part of the build-up to the club competing in the Women’s Super League for the first time.
Casey has set her stall out early ahead of the new campaign and wants to face some tough sides in preparation for what will undoubtedly be a step up in class from the 2018/19 season.
Valerenga will offer one of the sternest possible tests for United, given that the Oslo club will be midway though their league campaign when the sides meet in two months' time.