Stuttgart have warned potential suitors of Vedad Ibisevic that they have no intention of selling the striker.
Juventus midfielder Arturo Vidal has told the Italian press that he will not be going to Manchester United this summer.
The 25-year-old has been drafted in by Mark Robins as cover for regular left-back Blair Adams, who suffered an injury in Saturday's 1-0 home defeat to Yeovil.
Dickinson has made 44 appearances for the Hornets since joining from Stoke in the summer of 2011, but he has found first-team chances hard to come by by this season.
He has been restricted to only six appearances under Gianfranco Zola, and has not played a senior fixture since November.
Dickinson spent a month on loan with Portsmouth early this season, and he will now be with League One Coventry until 12 March.