N'Gala could return after he recovered from flu in time to be named on the bench in the 3-2 win against Bristol Rovers and came on to play a vital part in Argyle's winning goal.
Striker Joe Mason is likely to keep his place after impressing and scoring at the Memorial Stadium on Tuesday.
Defender Kari Arnason will not be suspended for the trip to Dean Court despite picking up his fifth booking of the season against Rovers because the cut-off point for players to be banned after receiving five cautions was on December 31.
Bradley Wright-Phillips has reportedly attracted interest from Barclays Premier League side Blackpool but the striker is expected to lead the line for the Pilgrims.
Source: PA
Source: PA