The defender is looking forward to challenging Aaron Cresswell for a first team place.
The former Hamilton defender was in impressive form last season in the Scottish Premiership and the Hammers moved quickly to secure the Scotland Under-21 international ahead of any competition.
He is joining the club as they return to the Europa League for the first time since 2006, while they will also be embarking on their first Premier League season under new boss Slaven Billic.
And Hendrie says he has arrived at the perfect moment.
“I know Slaven is a great manager and taking Croatia to the quarter-finals of the Euros shows the qualities he has.”
A challenge to replace Aaron Cresswell?
The youngster will have some work to do to break into the Hammers first-team, though, with current first choice Aaron Cresswell having impressed after joining from Ipswich Town last season.
The defender managed four assists in his first year at the club and was lauded for his crossing ability, with the 25-year-old being named Hammer of the Year by the club’s fans.
Many were saying he deserved an England call up for his performances, and Hendrie says he is looking forward to the challenge of trying to dislodge his new colleague.
“I like to get forward and whip in crosses but also be solid at the back,” he added.
“There is great competition for places and Aaron Cresswell obviously won the Hammer of the Year last season but I am looking forward to the challenge.”