Atletico Madrid received a huge boost ahead of Saturday's derby after Diego Godin returned to training on Wednesday.
Godin was forced off at half-time during Atletico's 2-0 win over Getafe last month and Sunday's 1-0 defeat to Real Betis.
The defender underwent an MRI scan and Atleti confirmed he had suffered "an elongation in the adductor muscle of the right thigh".
However, Godin has made a quick recovery and was back with Diego Simeone's squad as they prepare to host Real Madrid in La Liga on Saturday.
"Great morning, back to work with the team," Godin posted on Twitter in reply to Atletico confirming his return.