Micah Richards has revealed that he turned down a new deal at Manchester City to join Fiorentina on a season-long loan.
Chelsea full-back Cesar Azpilicueta has been handed a new five-year deal by the Premier League leaders.
The Pilgrims are currently in the relegation zone, announced the news on their official website.
They have been without a boss since they sacked Carl Fletcher on New Year's Day.
Sheridan has previously been in charge at Oldham and Chesterfield but has been out of work since the latter relieved him of his duties back in August.