Norwegian coach Deila is to step down as Celtic boss at the end of the season, a decision which has been met with mixed emotions from a number of the club’s supporters.
Despite winning back-to-back Scottish Premiership titles, Deila came under increasing pressure from the supporters largely as a result of the poor performances in Europe.
The Bhoys boast a big squad with plenty of options, and Lustig feels too many midfielders played its part in Deila’s downfall at Celtic Park as it became impossible to keep everybody fit and happy.
"There are a lot of players in the same positions and that's maybe one of the weaknesses that we have. We don't have 11 to 15 players who are always in the first team - there have been a lot of changes between games,” Lustig told The Scottish Sun.
"Of course everyone wants to play but when you try to keep everyone satisfied it ends up them maybe starting one game but then the next they are not in the squad.”
"Or from not being in the squad one week, you start the next game. As a player you want to know if you're a first-team player or if your role is to come on for the last 20 minutes.”
Most clubs enjoy success as a result of a consistent first-team XI, allowing for players to strike on-field partnerships with their team-mates which improves anticipation and team ethic.
However, too many players often leads to too many changes, prompting a lack of cohesion.
Celtic have struggles to name a regular starting eleven this season, and when it came to European and cup games there were a number of players who probably felt they shouldn’t have been left out.