The German defender, who is on loan from FC Cologne, missed the weekendâ€™s 0-0 draw with Norwich City because of illness with Bulgarian signing Manolev deputising at right-back.
But Riether says he welcomes the competition as it only makes Martin Jolâ€™s Fulham squad deeper for the season run-in.
â€śWe have more than 20 players here who can play and who want to play," he told Fulham's official website.
"Itâ€™s a long season and we have many games so itâ€™s important that if players are out injured or suspended, we have others who can fit in without a problem.
â€śFor me, itâ€™s been a great time at Fulham so far. It was my first experience of another country and it was a big step for me to come to England. But I have to say Fulham is like a family and I like playing here. The fans are great, I like the stadium and itâ€™s been all good so far.â€ť