The 30-year-old still has a year left on his contract with Crewe but it is understood the English League Two club won’t stand in his way for a second move to Scotland.
Saints would have been interested in bringing Richards back next season but the Welshman has decided that, with Mitov under contract for another year, United offers a more realistic route to Premiership football.
If he does move to Tannadice, he will have big boots to fill.
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Dundee United set to sign St Johnstone back-up goalkeeper Dave Richards
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