The 29-year-old has been in sterling form for Martin Jol’s side, making the right-back slot his own while becoming a cult figure with the fans in the process.
Riether’s loan deal contains a clause that would allow the former Bundesliga winner to stay in the Premier League with Fulham, should both player and club agree to it, but the German defender has said that he will consider his options.
“As things stand now, I will return to Koln in the summer,” he said to German magazine Kicker. “I have to consider and talk to both clubs.
“Nothing is decided yet. Fulham can activate a clause and I also have to agree.
"I wanted to become a starter (at Fulham), and I managed to do that. I am proud I have become a fans' favourite. But of course I can still do better, and that's what I am trying to do."
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He continued: “The football here suits me. Moreover, the club is very friendly and I received a warm welcome.
“Even smaller clubs take on high profile players for a lot of money. There are also fewer dives here.
“It wasn’t easy with the language. At first, I got nothing of what our Scottish assistant coach [Billy McKinlay] said.”