It was confirmed on Wednesday that Mane's glittering six-year spell on Merseyside has come to an end, with the forward swapping Anfield for the Allianz Arena.
The fresh terms come hot on the heels of a sensational 2021/22 campaign from the attacking midfielder, who registered 20 league goals and 13 assists en route to being voted as Bundesliga Player of the Season.
The 33-year-old has represented ATK, ATK Mohun Bagan and Odisha FC in the Indian Super League in recent seasons, and is a product of the Real Madrid Castilla.
The 30-year-old made 77 appearances over the past two seasons for PSV Eindhoven, where he won the Dutch Super Cup in 2021 and the KNVB Cup in 2022, registering 18 goals and 18 assists.
The 26-year-old joins the Hammers from French Ligue 1 club Rennes on a five-year contract and adds further quality and depth to David Moyes' squad. He will wear the No. 27 shirt.
Gravenberch is from footballing stock. His parents played amateur football, while older brother Danzell currently plies his trade in the Dutch second tier with De Graafschap.