The Brazil international is getting back to his best after returning from injury.
Ahead of their Europa League clash with SC Freiburg, Ward-Prowse said: "He's a fantastic player and a key part of the squad. Him just being on the training pitch gives everyone a lift.
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"He's a typical Brazilian player - he likes to enjoy himself on the pitch, and he's a great influence on all of us."
On his first season with the Irons, he added: "I've really enjoyed the start of my career at West Ham. I think it helped joining with the momentum of the Europa Conference League win, and it's been an honour so far."