Hull striker Sone Aluko is hoping to return to action before the end of the season after undergoing surgery.
The 24-year-old has had an operation to repair a damaged Achilles tendon amid fears he could be sidelined long-term with the injury.
Aluko, Hull's joint-leading scorer this season with eight goals, has been sidelined since January with a persistent Achilles problem.
But the club's medical staff are now confident he will be back in training by the middle of next month.
He has proved an instant hit with Tigers fans following his arrival in the summer from Rangers, scoring five goals in as many games in early November.
Meanwhile, fellow striker Matty Fryatt, sidelined since the Capital One Cup clash with Rotherham back in August, is making good progress following a similar operation and has targeted a return to training later this month.
The 24-year-old Englishman was a free agent after leaving Kilmarnock in January and has signed until the end of the season.
Russell discovered this week that he had suffered a fractured fibula and will be out for at least four weeks.
United manager Jackie McNamara said: "With Johnny Russell's injury, we are short on forwards and when I heard Rory was available I moved quickly to bring him in for a trial.
"He has shown me he can offer us something with his energetic and busy style so I am delighted to have him sign a contract.
"He is fit enough to be considered for action immediately and I think he is someone the United fans will quickly grow to enjoy.
"He offers us a different presence from what we have available currently and he is keen to show he deserves a longer deal so this deal makes sense for both parties."
Boulding only made one start and three substitute appearances for Killie after signing last summer from Livingston, where he scored 12 goals last season.
The former Mansfield, Bradford and Accrington player said: "After being offered the chance to come in and show my worth here, I am delighted to sign this contract which gives me a further opportunity to win a longer term deal at the club.
"The ability within this squad is excellent and I want to be part of that.
"The manager has a vision of how he wants to take this club forward and to be offered the chance to be involved is something I am looking forward to.
"I am sure the United fans will enjoy my style of football and I know that we have a great opportunity to have a magnificent end to the season and I will do my utmost to ensure that."
The Sky Blues were granted permission to hold talks with Pressley on Wednesday having identified the Scot as their number one choice to replace Mark Robins following his switch to Huddersfield three weeks ago.
And they have spent the past 24 hours attempting to iron out personal terms as well as a compensation package with his current Scottish First Division employers.
Coventry development director Steve Waggott said: "We've held very positive talks with Steven Pressley and Falkirk today (Thursday) and they are progressing well.
"We will continue working on the deal in order to reach a conclusion that is good for all parties."
City are looking for their third permanent manager of the season and fifth in total following Robins, Andy Thorn - sacked in late August - and caretaker bosses Richard Shaw and Lee Carsley, who has won three and lost two of his five matches at the helm in recent weeks.
Former Scotland defender Pressley, 39, enjoyed a brief playing spell with the Sky Blues during the 1994/95 Premier League season.
