Let r e ( S ) be the Euclidean spectral radius associated with a q-tuple S = ( S 1 , … , S q ) of bounded linear operators on a complex Hilbert space. The principal objective of our study is to establish various compelling upper bounds involving r e ( ⋅ ) . In particular, our findings demonstrate that, for all t ∈ [ 0 , 1 ] , we have r e ( S ) ≤ 1 2 max { ω ( S ) , ω ( Δ t ( S ) ) } + 1 2 ‖ S ‖ 1 2 ‖ S ‖ e 1 2 . Here, Δ t ( S ) represents the generalized spherical Aluthge transform of S , while the notations ω ( ⋅ ) , ‖ ⋅ ‖ , and ‖ ⋅ ‖ e pertain to the joint numerical radius, joint operator norm, and Euclidean operator norm, respectively, of operators in Hilbert spaces. Furthermore, we extend the notions of spherical and Duggal transforms and derive multiple upper bounds for r e ( S ) in relation to these transforms. Additionally, there are some applications that are derived as well.