Striker Sears, sidelined for six weeks with a knee injury, returned to full training last week but played no part in last Saturday's massive 2-1 win over Leyton Orient.
He did, however, make a goalscoring return for the club's reserve side in midweek and should he suffer no ill-effects then Sears will be firmly in the frame to feature at Meadow Lane.
Winger Porter is also back in the picture after playing for the U's second string having completed his three-match suspension.
However, Josh Thompson limped off with a hamstring injury after just 11 minutes of last weekend's win over Orient and will miss out.
Fellow centre-back Tom Eastman continues to struggle with the ankle problem which has kept him sidelined for five weeks.