Carroll has been named in the England squad to play San Marino and Poland, despite a hamstring injury limiting him to just one start for the Hammers this season.
Allardyce believes a stint with England will improve Carroll's match fitness - providing Roy Hodgson takes good care of him.
"I am glad (he has been called up)," Allardyce said
"Going off to England because he is short on match fitness would be a good thing for us and a good thing for him.
"I will liaise with Roy. Andy is in a position to play for him but (I want them to) just be careful about fatigue because fatigue is what brings injuries.
"Andy's match fitness is a little behind where we would like it to be.
"Helping him to perform for England and catch up on match fitness would be an ideal solution for the pair of us."