Roma boss Luis Enrique could once again be forced to use Daniele De Rossi as a centre-back.
The central midfielder will be considered in the role should Juan fail to prove his fitness in time for the game against Parma.
The capital club are short of centre-backs given that Nicolas Burdisso is out for the season with injury and Simon Kjaer is suspended.
If Juan doesn’t recover from a fitness issue, then the Spaniard will partner Gabriel Heinze with De Rossi or Marco Cassetti.
The Roman has already been used in defence this season – a stunning performance in the 1-1 daw with Juventus.
Blog: De Rossi – a future in defence?  Antonio Labbate on the possibility of permanently transforming Roma midfielder Daniele De Rossi into a centre-back.