According to Charlton Athletic's official club website, Coventry City have taken Leon Clarke on a 28 day loan.
City said on Christmas Eve that Clarke was on trial with a view to a permanent move in January, However, Charlton have said on their site; "And with the 28-day loan stay of Leon Clarke also confirmed to start at Coventry City on New Year’s Day, the two players (Leon Clarke and Yado Mambo who has gone on loan to Shrewsbury) could line up against one another in the clash at The Ricoh Arena."
Full story; http://www.cafc.co.uk/news/article/20121231-mamboshrews-570329.aspx