Defender Jason Kerr and Northern Ireland international Ali McCann have left St Johnstone.
Kerr, who started his career at the Perth club seven years ago, has joined Wigan in a deal worth around £600,000.
The 24-year-old captained the Scottish Premiership club to a historic League Cup and Scottish Cup double last season but has put pen to paper on a three-year deal at the League One side.
Saints chairman, Steve Brown, said: "During this transfer window, we have rejected bids for Jason, but Wigan Athletic met our valuation. From a club and, in particular, a financial point of view, it was an offer we could not turn down."
McCann, 21, has also left McDiarmid Park after joined Preston in a £1.2m deal - a figure that could rise above £1.75m with add-ons.
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The midfielder - who is currently on international duty with Northern Ireland - has agreed a four-year deal at the Lilywhites.