The Reds have already sealed deals for Danny Ings and Christian Benteke as well as attacking midfielder Roberto Firmino, who is also capable of playing as a forward.
Turkish news website Fanatik claims that the German will earn £2.5million-per-year, with a number of bonuses included to sweeten the deal.
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Mario Gomez looks set to join Besiktas despite interest from Liverpool
Gomez is set to receive £10,000 after each appearance, £248,000 if he plays in at least 20 matches, £178,000 if he scores at least 20 goals, £210,000 if Besiktas win the league and £140,000 if the club win the Turkish Cup.
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