The German World Cup winner and the Swiss international are now team-mates in Italy.
The Crystal Palace star absolutely shone during the 2-1 win over Tottenham Hotspur.
Celic defender Virgil van Dijk says there is interest in him, but the Hoops don't want to sell him.
Crystal Palace manager Alan Pardew and Newcastle United owner Mike Ashley are still in touch.
The 26-year-old faces an uncertain future at the Hawthorns if he continues to struggle for goals.
Former Manchester City and Tottenham Hotspur defender Vedran Corluka is reportedly on the radars of Leicester City, West Ham United and Aston Villa.
Harry Kane scored the goal for Tottenham in a 2-1 defeat at Selhurst Park.
Supporters of the Premier League champions were left disappointed by the winger's display.
The 25-year-old was seen as Queens Park Rangers' 'only positive' by many supporters after their record defeat at Burnley.
The 22-year-old impressed after coming on against Tottenham Hotspur.