Clubs voted for a third time to go against the rest of the world and stick with just three substitutes for top flight games.
And while the Chelsea manager understands why that makes sense to smaller clubs with smaller squads, he is concerned that league position is seen as more important than avoiding dangerous injury.
"When we spoke about it with the managers, the overriding factor – whether they were for or against – was that this was a case of player welfare, whether we were for or against, and not putting them at risk," Lampard said ahead of the visit of West Ham to Stamford Bridge on Monday.
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"There were 10 clubs who voted against it. It was not about advantages, only player welfare. Only them voted against it in Europe, in the world.
"There must be a reason for it. Every club wants to stay in the league, some win the league, but here's pretty much the only league, because the Championship decided differently.
"It's not for me to give an answer."
PROBABLE CHELSEA TEAM (4-3-3): Mendy; Azpilicueta, Zouma, Silva, Chilwell; Kovacic, Kante, Mount; Werner, Abraham, Pulisic.