Marshall has been on the books of Wolves since January 2017 when he joined from Blackburn Rovers.
The 26-year-old, who can operate as a winger or as a right-back, has struggled for playing time so far this season.
Zyro joined the Wanderers in January 2016 after leaving Legia Warsaw, but the 25-year-old winger suffered a serious knee injury and has failed to make a huge impact at the Molineux Stadium.
The Express & Star has now claimed that both Marshall and Zyro have attracted interest from clubs in England.
It has also been reported that Wolves would prefer to sell the two players, but the Wanderers are also open to loan deals for the duo.
Wolves are going strong in the Championship at the moment and look set to win automatic promotion to the Premier League at the end of the season.
Given that the Wanderers are (reportedly) open to selling Marshall and Zyro, perhaps this is the end of the road for the duo.