It is claimed that midfielder Pedro Obiang will also be allowed to leave West Ham United.
West Ham United striker Lucas Perez is reportedly close to leaving.
Champions League side Schalke have made a surprise bid for the West Ham star.
Both West Ham's Perez and Tottenham's Janssen have been linked with Spanish side Real Betis.
Perez has struggled at West Ham since joining the club from Arsenal in the summer.
West Ham United striker Lucas Perez was a Manuel Pellegrini summer signing, but he has struggled to cement himself into the starting XI.
West Ham United striker Lucas Perez could leave this week.
West Ham United paid Premier League rivals Arsenal £5m for Spanish striker Lucas Perez during the summer transfer window.
It seems like the striker may leave West Ham United this month.
Spurs have been linked with a move for Paraguay striker Sanabria.
Updates involving Everton, Newcastle United, West Ham United, Sheffield United and Sheffield Wednesday.
The Spaniard has only played six times for Arsenal since his move from La Liga.
Following the international break, we look at three Arsenal players who need to step up their game coming back into club football.