Riether, 29, is currently on loan from German club Cologne but has impressed for Fulham since joining in the summer.
The former Wolfsburg full-back has already featured 29 times for Martin Jol’s side, but could still be plying his trade back in Germany next campaign.
“Nothing is decided yet,” he told German magazine Kicker. “Fulham can activate a clause, and I also have to agree.
“As things stand now, I will return to Cologne in the summer. But I have to consider and talk to both clubs.
“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.”
Riether was also full of praise for his fellow Barclays Premier League players and believes the style of football in England compliments his own abilities more than in his native country.
“The players here all have an amazing individual quality,” he said.
“Even smaller clubs take on high-profile players for a lot of money – there are also fewer dives here.
“The football here suits me. Moreover, the club is very friendly and I received a warm welcome.”
A goal apiece from James Tomkins and Luka Milivojevic handed Crystal Palace a crucial 2-0 win over Huddersfield at the John Smith's Stadium on Saturday evening.
Manchester United bounced back from their Champions League exit as they beat Brighton 2-0 at Old Trafford on Saturday night to reach the FA Cup semi-finals.
Tottenham reached the FA Cup semi-finals after they cruised to a 3-0 victory over Swansea in their quarter-final clash at the Liberty Stadium on Saturday.
Premier League basement club West Brom squandered the lead as they suffered a 2-1 defeat to Bournemouth at the Vitality Stadium on Saturday.
Chesterfield boss Jack Lester felt his side were unlucky not to claim all three points after their 1-1 draw at Cheltenham.
New Swindon manager Phil Brown revelled in his side's victory at Cambridge in his first game in charge.