It is understood Southampton will pay the £6million fee up front
Southampton have reportedly agreed a deal to sign Celtic’s Stuart Armstrong.
The attacking midfielder is set to move for £6million after personal terms are discussed.
Armstrong signed a new two-year contract with the Scottish Champions last summer.
Saints are looking to strengthen their squad after narrowly avoiding relegation from England’s top flight.
And it is understood they will pay the £6million up front with the figure rising depending on various factors.
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After joining the Hoops in 2015 from Dundee United, Armstrong scored 17 goals in Brendan Rodgers’ first season in charge of Celtic.
Armstrong has won four Scottish Premiership titles at the Glasgow club.