"I have fond memories of my time with BMW Motorsport and am very excited about testing the BMW M3 DTM," the German said in a statement on the BMW website (www.bmw-motorsport.com).
"Furthermore, I am bound to see a few familiar faces in Valencia from my previous time with BMW. I am really looking forward to it."
BMW motorsport director Jens Marquardt worked with Glock, who started out as a teenager in Formula BMW and was BMW-Sauber's Formula One test driver in 2007, at the Toyota F1 team until the end of 2009.
Marussia announced on Monday that Glock, who had a contract for 2013, would not be driving for them this season after a mutually agreed separation due to financial reasons.
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