Roberto Firmino has also been linked to Tottenham Hotspur and Liverpool previously.
Manchester United became the latest club linked to sensational Brazilian attacker Roberto Firmino earlier this month.
The 23-year-old struck his first goal for the Selecao on his international debut against Austria this week, a superb long range effort.
United scouts were reported to be in attendance at the game, and even before that The Metro had claimed the club were interested in the attacking midfielder.
No deal is expected in January however, according to Bundesliga club Hoffenheim, but they admit they cannot hold onto him forever.
Sporting director Alexander Rosen told Sport1: "Until the end of the season neither of them (Firmino or Volland) will move from here because if you watch them play you understand that have not been forced to remain at Hoffenheim, but they are happy to play with this team.
"We know that we can not keep them with us until the end of their careers and we willhave significant market offerings, but now we do not think about it. In the summer we'll see."
Amid interest from Liverpool last season, Hoffenheim got Firmino to sign a new deal, protecting their investment. Figures being discussed then were around £15 million, but after his international goal and the 16 strikes and 11 assists he recorded in Germany last season, his valuation is on the rise.