Southampton have signed Scotland international Stuart Armstrong from Celtic on a four-year deal for a reported £7 million.
The midfielder was beset by injuries last season, one year after scoring 17 goals.
He is the Premier League club's first signing of the summer.
"Southampton seems a really good fit for me," Armstrong said in a statement. "Watching from afar, I really enjoy the attractive football that they play and I'm very happy to be here."
Southampton narrowly avoided relegation last...