This happens to me when I'm into the game after a few hours. I just refresh and new auctions reappear.
It seems the game is not able to queue new players auctions to the ones already present.
Winning Eleven season records:
15 Leagues won : 1, 5, 7, 9, 11, 13, 14, 18, 19, 20, 23, 24, 25, 30, 31, 38 - Runner up: 8, 10, 15
9 Champions League won: 7, 9, 11, 19, 20, 21, 24, 31, 33 - Runner up: 15, 16, 26, 34
1 Super League won: 38
7 Cups won: 17, 18, 20, 23, 24, 33, 35 - Runner up: 9, 14, 34, 38
E restart of the app should definitely help out here, as Tyltyl suggested. It does seem that for some reason the Auction list just can't populate it self with an updated assortment of players put on auction.
Do tell if this happens again!