Wolfsburg have completed the signings of Liverpool centre-back Sotirios Kyrgiakos, and Trabzonspor left-back Hrvoje Cale, the 2009 Bundesliga champions announced on their official website.
Kyrgiakos, 32, penned a two-year contract with the Lower Saxony side, who this year have not been as consistent in defence as coach Felix Magath had hoped.
"As our central defence has not been stable, it was necessary to do something about it. Kyrgiakos is a player who will strengthen us immediately and can help," the trainer told Wolfsburg's official website.
"He is experienced, knows the Bundesliga and the rhythm and does not need time to adapt."
The Greece international previously played in Germany between 2006 and 2008 while at Eintracht Frankfurt. He joins on a free transfer.
Cale, 26, signed a three-year deal after terminating his contract with Trabzonspor.
"VFL are a very good club. I am impressed with their structure and organisation. For me it is a special opportunity to play here, I'm proud of it. Felix Magath is a really great coach, and I wanted to work with him," he said.
At Wolfsburg, Cale will wear the number 26 shirt; Cale, the 16.