Coach Roberto Martinez says there is a "desire to find negative news" about his Belgium squad.
The world's second-ranked team laboured to a 1-0 win over Canada in their World Cup opener before losing to Morocco.
Reports claim that senior players then clashed but goalkeeper Thibaut Courtois has said rumours of division within the squad are "invented stories".
"Some people are quite happy to jump on fake news," Martinez added before his side's last group game against Croatia.
"It is quite astonishing. It shows you that maybe there is more desire to find negative news about the team rather than enjoy the best generation of talent that we've ever had in Belgian football."
Belgium have reached at least the quarter-finals at each of the past four major tournaments and won the third-place play-off at the 2018 World Cup.
The Red Devils have to win on Thursday to be sure of reaching the last 16 but a draw would be enough for 2018 runners-up Croatia, who beat Canada 4-1 last time out.
"We will not be fooled by media stories and rumours," said Croatia coach Zlatko Dalic.
"We are expecting the best from Belgium, a great team with excellent players. We must not relax. [Martinez] is a great coach and will know how to hurt Croatia."
Croatia coach Zlatko Dalic may pick the same side that thrashed Canada.
Luka Modric is one booking away from a ban but is still expected to play, while Nikola Vlasic is again expected to miss out due to injury.
Belgium coach Roberto Martinez will be forced into one change because of Amadou Onana's suspension so Youri Tielemans could come back in.
Romelu Lukaku made his first appearance of the tournament as a substitute against Morocco and could start after recovering from a thigh injury.
-- Courtesy of BBC Sport