The pair could face each other in the final on Sunday if they manage to battle past Milos Raonic and Grigor Dimitrov in their respective last-four clashes.
Henman is quoted as saying by The Express: "I said Novak Djokovic would win before the tournament started. Now, my heart says Roger but my head says Novak.
"The way Roger is playing, having only lost his serve once, he is a tough match for anyone. Novak is playing well, but when he gets to the latter stages of tournaments, he can raise his level and get the victory. There is more in the tank."
The pair both play their semi-final matches on Centre Court later today.