Former MK Dons midfielder Keith Andrews is to take up a full-time coaching role with the club this season.
Midfielder Gary Deegan has signed a new one-year deal at Southend.
Paulo Sergio is awaiting the next move from the Hearts board over his future as the capital club prepare for their final match at Tynecastle of a tumultuous season which could yet end on a high.
Sergio, who succeeded Jim Jefferies as Hearts boss in August, is out of contract at the end of the campaign which concludes with the William Hill Scottish Cup final against Hibernian on May 19.
First Hearts meet St Johnstone in the Clydesdale Bank Premier League in Edinburgh on Sunday seeking a win to keep their bid for a place in the Europa League alive until the final day of the SPL season.
Sergio has guided Hearts through a challenging campaign featuring wage delays and previously stated his desire to remain at Tynecastle.
However, Sergio is at the mercy of owner Vladimir Romanov, director Sergejus Fedotovas and managing director David Southern over an extension to his current contract.
"The timing is not mine," Sergio said. "It's not me that should be asking the board to sit around the table.
"We have been talking, people showed to me that they want me to stay, but the next move is not mine. The next step is for the ones who pay."
Sergio insisted he is not concerned about what the future holds.
Sergio said: "I'm never worried about the future. Our future is today.
"If you do well today, I'm sure tomorrow the sun is going to be shining.
"If you forget to do what you should do every single day, maybe tomorrow it's raining.
"Live your day, do what you can, live 100% every minute of your life. It's the way I live."
Victory for St Johnstone would wrap up fifth place for the Perth side and a place in the Europa League next term, meaning Hearts' only avenue to continental competition would be by winning the first all-Edinburgh Scottish Cup final since 1896.
Hearts lost 1-0 to Motherwell on Tuesday - a victory which helped to secure Champions League qualification for the Lanarkshire side - and Sergio called for his side to show the same desire as their opponents on Sunday. It was an area where he felt they were deficient on Tuesday.
"For them a good result here means qualification for Europe," he added.
"St Johnstone will be motivated as ever to get a result here at Tynecastle.
"That kind of motivation sometimes can be the difference. We can't just be waiting for the cup final to put in 100%. We should put that in every single day."
The match is set to mark the final Tynecastle appearance for some of the Hearts squad, including midfielder Ian Black, who was this week told his contract would not be extended.
"As a manager I would like to have Blacky with me, but it's a decision I can do nothing about," Sergio added.
"From the point of view of our board, I think it's a financial decision, because nobody here should have doubts about the quality of the player.
"I believe Blacky is happy with that decision too, because maybe he wants to try himself at a higher level."
That higher level, possibly in England, could be for Scotland under Craig Levein, according to Sergio.
The Portuguese added: "I'm sure he's not going to disappoint Craig if he has a chance in the national squad."