The Liverpool full-back took to Twitter to wish his former team-mate all the best.
The Spaniard is believed to have joined the Bundesliga champions for a fee of a little as £2 million, after falling out of Brendan Rodgers' first-team plans.
Reina spent last season on loan at Napoli after Rodgers signed Simon Mignolet from Sunderland, with the Belgian now Liverpool's undisputed no.1.
Following the 31-year-old's Anfield exit, the Reds wished him the best of luck for the future on their official twitter account, a gesture defender Jose Enrique has replicated on his personal account.
Enrique played alongside his fellow Spaniard several times after being signed by Liverpool in 2011, with the pair linking up to win the Carling Cup under Kenny Dalglish in 2012.
The full-back was full of praise for Reina, calling him an 'amazing' goalkeeper and an all round great guy.
In other Enrique news, the 28-year-old has declared himself fit for Liverpool's Premier League opener against Southampton.
“I'm feeling good," he said. "I was training on my own and running a lot, and it's not the same when you play with a team, because it's a lot more with the ball and a different type of running.
"I'm still getting my fitness back but I feel really good and confident that I can play soon. It's little by little and not just me, everyone is getting their fitness.
“If the manager wants me to play in the first game of the season, I am ready, of course."