Wasps have completed the signing of James Johnston from Saracens.

The Samoa international will make the switch to the Ricoh Arena having made 51 appearances for Sarries following his arrival from Harlequins in 2013.

"We're really pleased to add James to our ranks ahead of the new season, having always been impressed with his performances against us, whether in a Saracens or a Harlequins shirt," director of rugby Dai Young told the club's official website.

"His addition provides us with real depth and competition at tighthead, which is what you need at this level of the game."

Meanwhile, 29-year-old Johnston added: "When Wasps came in for me, I had no hesitation. Having watched the changes the club has made in the past few seasons, it is clear that Wasps are going places and I am really excited about being involved."

Johnston is the ninth signing that Wasps have made this summer after the arrivals of Jimmy Gopperth, Frank Halai, Dan Robson, George Smith, James Downey, Brendan Macken, Tom Bristow and Jamie Stevenson.