We study the nuclear medium effects on the proton electromagnetic form factor ratio GEp/GMp within a light‐front constituent quark model with different quark spin coupling schemes and momentum components of the wave functions. We compute only effects from the quark and nucleon in‐medium masses. The effective masses are obtained from a relativistic σ ‐ ω self‐consistent mean‐field approximation of the nuclear matter within a quark‐meson coupling model. Our calculation describes qualitatively the recent experimental data.