The German defender already has 19 caps for his nation, but has not played international football in seven years.
A selection of the latest stories in the media involving Liverpool Football Club this Tuesday morning.
The Black Cats are currently sitting in the bottom three with 13 games remaining.
The winger scored in his side's 2-0 win over Bournemouth on Sunday.
The Greek international failed to score in three appearances for The Cottagers.
Newcastle United have a new striker in their ranks.
Gary Rowett's men's next game is an away trip to managerless Rotherham United.
The Argentine was sent off 25 minutes into his return from Tottenham Hotspur.
The Manchester United youngster has not been a regular goalscorer on previous loan moves to the Championship.
Liverpool and West Ham United go head-to-head this week.
The former Chelsea star's comments suggest a move to the Premier League will happen sooner rather than later.
Raheem Sterling will tell Liverpool he wants to leave the club, according to several reports.
HITC Sport understands Fulham are leading the race to sign in-demand Portsmouth midfielder Jed Wallace.