Striker Callum Morton has joined from West Brom while goalkeeper Steve Benda has moved from Swansea.
Meanwhile, Joel Randall has been struggling with a hamstring issue and could miss out against the Sky Blues.
Jack Marriott and Ricky-Jade Jones are also ruled out and Dan Butler (ankle) is sidelined for the rest of the season.
Coventry boss Mark Robins has some selection issues, with a number of players returning.
Centre-back Kyle McFadzean and midfielder Liam Kelly were due to return to training this week after completing a period of isolation.
Ben Wilson has played in the last two games after first choice Simon Moore tested positive for Covid.
Chelsea loanee Ian Maatsen has been nursing a hamstring injury and remains a doubt.
Peterborough United continue to be active in the transfer market and Darren Ferguson has since bolstered his options with the two loans, joining alongside Joe Taylor and Bali Mumba so far in this window.
Morton spent the first half of the campaign in League One with Fleetwood before the switch to Posh this week, bagging seven goals in 22 games.
Posh owner Darragh MacAnthony said he signed the 21-year-old with a view of making the move permanent in the summer.
They had already secured their second loan signing of the transfer window on Tuesday morning in the form of Swans keeper Benda, who joined on a loan deal until the end of the current campaign.
The German international, standing at 6ft4in, bolsters Ferguson’s options in-between the sticks after the departures of Christy Pym to Stevenage earlier in the window and Daniel Gyollai to Maidenhead.
Benda was the Welsh side's first-choice keeper at the beginning of the current campaign, starting the opening five games in the Championship and two in the Carabao Cup, keeping three clean sheets, but he has failed to feature since back-end of September.
Speaking to ThePosh.com, Ferguson believes the signing of Benda will provide excellent competition to David Cornell, who has started the last 17 games, and will allow youngster Will Blackmore to leave on loan.
Ferguson said: "He is a good addition and will provide good competition. We have two good goalkeepers fighting for one place. This will mean we can get young Will Blackmore out on loan, which is important for us.
"Steven has got good Championship experience, is a really good size at 6ft 4, is decent with his feet and I am really looking forward to working with him."
The 23-year-old joined Swansea City in the summer of 2017 from TSV 1860 U19, heading straight into the Welsh side U23 squad. The German international enjoyed a loan-spell at Swindon Town in the 2019/20 campaign, making 27 appearances and helping them secure promotion to League One.
After Russell Martin’s secured the signing of goalkeeper Andy Fisher from MK Dons, Benda was eager to play regular first-team minutes in the second part of the season.
He told ThePosh.com: “It was a move that really interested me. I want to play regular first team football and hopefully I can do that here. It is great that it has been done at the start of the week, it means I can meet my new team-mates, train hard and see where that takes me ahead of the weekend.
“I like to think I am an all-round goalkeeper, I think you have to be these days, but I like to try and use my height to come out and claim crosses and hopefully take a bit of pressure off the defenders in front of me.”