"We'll use the time to get him fit for November, but it's suddenly just come around a lot quicker that we've had to make a hard decision based on Heineken Cup registration when you have a lot of your forward pack missing."
Boer replaces Marco Bortolami, who is out with a dislocated shoulder, in Gloucester's list of 38 players who are registered for the Heineken Cup.
He is expected to be part of Gloucester's squad for Saturday's trip to Biarritz.
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