"There are nominators who like trumpeting in public which person they nominated," Peter Englund, who is also the permanent secretary of the Swedish Academy, wrote on his blog.
"This is a flagrant breach of the rules. We actually have the possibility of disqualifying the candidates in question and it is not impossible that this will happen with one proposal or another in the future."
Englund suggested that certain interests may lie behind certain leaks but he did not give any concrete examples.
As with the Nobel Peace Prize, a wide range of people have the right to propose names for the literature prize, including former laureates, members of the Swedish Academy, heads of national literary societies and literature academics from around the world.
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For the 2015 prize, to be awarded in October, Englund said that 198 names are currently on the list, including 36 new names.
As in previous years the number will be reduced to between 20 and 25 in April and cut down to just five in May.
The list of candidates nominated for the prize is kept secret for 50 years.