Janssen spent the 2017-18 season on loan at Turkish giants Fenerbahce from Premier League club Tottenham.
The 24-year-old Netherlands international had injury problems during his time in Turkey, but the striker still scored four goals and provided two assists in nine league starts for Fenerbahce, according to WhoScored.
Janssen has suggested that he wants to return to the Turkish giants next season, although the Dutchman has made it clear that he is open to other options.
"I had a fantastic year despite the injury, and I have the feeling that the chapter with Fenerbahçe has not yet been closed," Janssen told NOS.
“That does not mean that Fenerbahçe is my only option. I am open to everything. There is nothing at the moment and it is easy to wait."
Janssen, who earns £25,000 per week as salary according to The Daily Star, failed to make an impact at Tottenham during the 2016-17 season.
The Dutchman is a good striker, but it is hard to see Spurs manager Mauricio Pochettino give him another chance, especially as the Argentine signed Fernando Llorente last summer.
It would be best for the 24-year-old to leave Spurs on a permanent basis this summer, as it is clear that his future at the North London club is very bleak.