Slaven Bilic took to his programme notes to praise Victor Moses' breakthrough at Chelsea after working with him during a loan spell at West Ham last year.
Moses made his first league start for Chelsea since May 11, 2013 against Hull City earlier this season and quickly became a cornerstone of Antonio Conte's Premier League leaders in a more withdrawn wing-back position.
The West Ham manager only used Moses in 21 games last term but says his talent was obvious and that his work rate has improved as he becomes a regular in a competive Chelsea side.
"Of course we welcome Victor Moses back to the club tonight," Bilic said in West Ham's match day programme. "Vic has had a fantastic season and I am pleased for him.
"His characteristics were always amazing - his strength, his pace, his quality on the ball and his stamina are basically top, top-class.
"Sometimes you have to push him to do it day-in, day-out and now he is doing it, and all credit to him because he has kept his place in a very good side."