Southend United midfielder Ryan Leonard has been ruled out for up to three months with a knee injury.
The 23-year-old was injured courtesy of a heavy challenge from Colchester United's Alex Gilbey during Saturday's Essex derby.
Gilbey was shown a straight red card.
Scans have revealed that Leonard sustained medial ligament damage.
Norwich City striker Jamar Loza has joined Southend United on loan until the end of the season.
Loza is no stranger to Roots Hall, having also spent time on loan there in 2014.
The deal includes the option for a permanent move in the summer.
"I've worked with Jamar before, he's a likeable guy. He comes in with a smile on his face, trains with a smile on his face and plays with a smile on his face.
He knows us well, we know him well, we know he's got pace and a eye for goal. He leads the line, he's gets in behind, and he's a threat with his goal prowess.
We thought it was a no brainer to bring in Jamar until the end of the season, it provides us an opportunity to know and understand the player even more whilst forming a basis for continuity once the loan period comes to an end with a view to a permanent deal at the end of it."
Southend United centre-back Luke Prosser has joined Northampton Town on loan until the end of the season.
The 27-year-old has been with the Shrimpers since 2010, but has found first team opportunities harded to come by this season in League One.
Prosser's contract at Roots Hall expires in the summer.
"I'm really pleased to bring Luke in.
I have been an admirer of his for a while and this is another signing that will strengthen us at a key time in the season.
As James Collins did, Luke also won promotion from this level last season, and that knowledge and experience can only help us.
We have a really hectic schedule coming up, and to be able to add Luke's ability, knowhow and experience to the squad is a big boost and a huge help to the players who are already here and have done so well to get us to the position we are in."
Meanwhile, former Southend loan star Joe Pigott will spend the rest of the campaign at Luton Town.
Pigott has signed on loan from Charlton Athletic and helped Southend gain promotion from League Two last season.
“I’ve worked before Joe before. He’s an excellent young striker who has scored goals wherever he has been.
He’s been brought into the Club because he is the type of player we want here. He fits all of our criteria and adds competition to an area we are already very strong in."
Elsewhere, Stevenage defender Jamie McCombe has left the club by mutual consent.
Southend United have completed the loan signing of West Ham United defender Stephen Hendrie.
The left-back joined the Hammers in the summer from Hamilton Academical but has struggled for first team opportunities.
Hendrie will spend the next month at Roots Hall and help cover for the injured Ben Coker.
"I’m absolutely delighted.
He comes here making his English debut, having not played first team football since he left Hamilton Academical.
I spoke to his former manager, Alex Neil, last night about him, to ask about the type character we’re bringing in.
He says he’s a solid character, reliable, got bags of energy and probably his biggest asset will be his legs, as he can run all day."
Meanwhile, Stevenage have signed Forest Green Rovers striker Aaron O’Connor on an initail month's loan.
Brett Williams has moved in the opposite direction.
Millwall winger Lee Martin has joined Northampton Town on a month's loan.
Southend United have signed Shrewsbury Town striker Tyrone Barnett on loan until the end of the season.
The 30-year-old is no stranger to the region, having also played for Peterborough United and Ipswich Town.
“I was aware that the club was interested in me previously, but I’ve always been a fan of Phil Brown.
I spoke to the manager a couple of days ago, and he’s told me his plans.
I followed the club obviously through playing in the same league, together the aspirations are getting in the play-offs, and hopefully getting promoted.
People seem to label me as a target man but I like to hold the ball up, get in the box, and hopefully get on the end of crosses."
The pop star Justin Bieber's been pictured with a Southend shirt after one of the club's players credited him with inspiring him to scoreRead the full story ›
Southend United midfielder Ryan Leonard has revealed who has been behind his recent goalscoring run, and it's not who you might expect...Read the full story ›
Former Peterborough United manager Dave Robertson is back in work - just a few weeks after he was sacked as Posh boss.
The 41-year-old has been appointed as the new under 21s manager at fellow League One club Southend United.
Robertson was dismissed from his role at the ABAX Stadium after Posh made a poor start to the season, with ex Stevenage manager Graham Westley replacing him.
Robertson takes over from Dale Brooks at Roots Hall.
Southend United have completed the permanent signing of former Burnley defender Luke O'Neill.
The 24-year-old has been on loan at Roots Hall this season but has now put pen to paper on a two-year deal.
O'Neill was released by Burnley earlier today.
Southend United have signed former Ipswich Town striker Noel Hunt on a free transfer.
The 32-year-old was allowed to leave Portman Road at the end of last season after he wasn't offered a new deal.
Now, the Irishman has agreed a one-year contract, with the option of a further 12 months, at the League One side.
"He's an ambitious lad and is a feisty character. Hopefully he'll bring all that to the party and I'm really looking forward to working with him and the rest of the team.
It's a massive coup and probably my biggest signing since I've been here. It's a sign of the backing from the owner once again that we've managed to get him in.”