The 46-year-old German has enjoyed an impressive spell with the Terriers since taking over from Chris Powell in November 2015 as he guided the club to promotion via the Championship play-offs 12 months ago in his first full season at the helm.
Wagner defied the pre-season odds by ensuring that Town will again be playing in the Premier League again next term via a 16th-place finish.
His achievements have not gone unnoticed in his homeland with Eintracht Frankfurt looking to bring in a new boss with current head coach Niko Kovac on his way to Bayern Munich.
Wagner recently refused to guarantee that he will remain in charge at the John Smith’s Stadium despite Town chairman Dean Hoyle appearing confident that he will stay put.
And with Frankfurt reportedly set to match Wagner’s current £2.5million-a-year wages, the former Borussia Dortmund coach could be tempted to return home to prove himself by helping the club achieve their target of a top-four finish and Champions League qualification.
Burnley could be set to go back in for West Brom winger James McClean after the Baggies were relegated to the Championship.
Everton are tracking Hamburg defender Josha Vagnoman but face strong competition to land him in the summer transfer window.
Tottenham are reported to be lining up a swoop for South Korean attacker Hwang Hee-chan, who plays his football for Red Bull Salzburg.
Manchester United goalkeeper Sergio Romero has been ruled out of the World Cup for Argentina because of a knee injury.
Maurizio Sarri could be on his way to Chelsea after dropping a strong hint that his time with Napoli is drawing to a close.