The Sky Blues appear to be favourites for the Trinidad and Tobago international strikers signature but Leeds are also in the hunt for John.
The Sky Blues say they are at an advanced stage in talks with a Premiership striker but are unwilling to identify the player although the Coventry Evening Telegraph claims that a £250,000 fee has been agreed between Blues and Coventry.
John is currently away on international duty with The Soca Warriors who face Mexico in a World Cup 2006 qualifier on Wednesday.