The Angels have designated Rich Thompson for assignment, reports MLB.com's Alden Gonzalez (on Twitter). The move creates roster space for Brad Mills.

Thompson, 27, has allowed four runs in 2 1/3 innings this year. The Australian-born right-hander pitched to a 3.00 ERA with 9.3 K/9 and 3.3 BB/9 in 54 innings for the Halos last summer. He is out of options and could not be sent to the minors without first clearing waivers, and there's a chance Thompson will be claimed given his strong 2011 performance.

The Angels acquired Mills from the Blue Jays in exchange for Jeff Mathis back in December.

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