Liverpool goalkeeper Loris Karius has praised former club Mainz over their new keeper signing.

Mainz have snapped up Rene Adler this summer from Hamburg.

"I can only congratulate Mainz on the transfer," said Karius to BILD.

"The 255 Bundesliga games he did achieved not without reason. An outstanding goalkeeper!

"It's good to have such a leader in the squad. He's a great addition to the guys!"