West Ham owner Sullivan delighted with Hitzlsperger deal
The 28-year old joined the Hammers as a free agent after leaving Italian club Lazio and as the club's first summer signing he has put a spring in the step of Sullivan.
"I am delighted to welcome Thomas to the club," he told the club's official website.
"We had to move quickly to secure his services when he became available, especially as there was understandably so much interest in him from around Europe and back in Germany.
"I am especially pleased that he is excited by what we are trying to achieve here at West Ham."