The Hammers new signing 'can't wait' to play in the Premier League and at Upton Park, and has said that it will be privilege to wear the claret and blue next season
The Romanian captain arrived from Shakhtar Donetsk on a free transfer earlier this month after playing over 300 games for the Ukranian champions.
And Rat said he can't wait for the new season to come, insisting it will be a very proud day.
"First of all I am very happy to wear a West Ham United kit," Rat told West Ham TV.
"I think this kit has a very good quality and is of high standards.
"For me it's an honour to wear this shirt and to play in the Premier League. I will be very proud to wear the claret and blue colours and I hope to satisfy the fans.
"I'll be very excited when I pull on the kit for the first time, because it will be my first game here."
Rat has played 89 times for Romania, making his debut back in 2002.