Mainz sporting director Rouven Schroder says the club did everything they could to prevent goalkeeper Loris Karius completing his move to Liverpool.
Karius, 24, was unveiled as Liverpool's new no. 1 on Tuesday 24 May and will become the club's second signing of the summer alongside Cameroon international Joel Matip, who will arrive on a free transfer on 1 July.
The former Manchester City academy youngster made 36 appearances in all competitions for Mainz last season. While the club are disappointed to have lost such a key player, sporting director Schroder admits Karius left the Bundesliga club with everyone's blessing, insisting Liverpool have signed a player who is the "complete package".
"Anyone who delivers consistently good performances in the Bundesliga over a long period as an almost complete package of goalkeeping and good footballing skills brings attention from the big clubs in the Premier League," Schroder told Bild.
"We tried everything in the last few days once again in order to keep our no. 1 goalkeeper, but unfortunately we had to comply with his request."
Karius is expected to instantly challenge Simon Mignolet for a spot in Jurgen Klopp's starting XI.
"It's a very good feeling and it's an honour to play for a club like this," he said in an official statement to confirm the transfer. "They have a special history and the fans are amazing here, so I look forward to playing at Anfield.
"I know a lot about the club from watching them on TV. The history, everybody who plays football knows. There are lot of things in my head when I think of this club. I spoke to the manager and I had a good feeling afterwards because he told me what he wants to do with the club and with the players. It was a good talk with him and after that I was convinced this was the right decision."