The hit-man featured in a full-scale practice match and is now available for Wednesday's clash against former club Wigan.
League goals have been a problem for manager Sam Allardyce this season, although they did score four times in the second leg of their Carling Cup semi-final against Aston Villa last week.
Roberts, along with Benni McCarthy, have been linked with moves away from Ewood Park in January with Wolves now interested in the Grenada international.
Wolves have reportedly turned their attention to the striker, who turns 32 on Monday, after missing out on Stoke City's James Beattie.
Blackburn 5/6, Draw 12/5, Wigan 7/2
Source: Team Talk
Source: Team Talk