New York Giants quarterback Eli Manning (10) takes the field with teammates prior to an NFL football game against the Atlanta Falcons, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Kathy Willens)

Atlanta Falcons wide receiver Julio Jones (11) is unable to catch a pass as New York Giants cornerback Dominique Rodgers-Cromartie (21) defends during the first half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Kathy Willens)

Atlanta Falcons running back Steven Jackson (39) scores on a touchdown run as New York Giants middle linebacker Mark Herzlich (58) and defensive end Jason Pierre-Paul (90) try to tackle him during the first half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Bill Kostroun)

New York Giants running back Rashad Jennings (23) is tackled by several Atlanta Falcons players during the first half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Kathy Willens)

New York Giants wide receiver Rueben Randle, left, celebrates with teammate Victor Cruz, right, after scoring on a touchdown pass from quarterback Eli Manning against the Atlanta Falcons during the first half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Bill Kostroun)

Atlanta Falcons wide receiver Julio Jones (11) is unable to make a catch as New York Giants cornerback Dominique Rodgers-Cromartie (21) defends on the play during the first half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Bill Kostroun)

New York Giants wide receiver Rueben Randle (82) is tackled by Atlanta Falcons cornerback Desmond Trufant but scores on a touchdown pass from quarterback Eli Manning during the first half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Bill Kostroun)

New York Giants quarterback Eli Manning (10) avoids the tackle of Atlanta Falcons defensive end Malliciah Goodman (93) while throwing a pass during the first half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Bill Kostroun)

New York Giants wide receiver Rueben Randle, right, fumbles the ball while being tackled by Atlanta Falcons free safety Dezmen Southward (41) and cornerback Desmond Trufant (21) during the first half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. The Giants recovered the ball on the play. (AP Photo/Seth Wenig)

Atlanta Falcons wide receiver Julio Jones is unable to grab a pass from quarterback Matt Ryan during the second half of an NFL football game against the New York Giants, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Seth Wenig)

Atlanta Falcons running back Antone Smith, right, avoids the tackle of New York Giants strong safety Antrel Rolle before scoring on a touchdown reception during the second half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Bill Kostroun)

Atlanta Falcons wide receiver Julio Jones dives but is unable to catch a pass from quarterback Matt Ryan during the second half of an NFL football game against the New York Giants, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Kathy Willens)

Atlanta Falcons running back Antone Smith, right, is chased by New York Giants cornerback Dominique Rodgers-Cromartie while scoring a touchdown during the second half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Kathy Willens)

New York Giants wide receiver Odell Beckham (13) makes a touchdown catch on a pass from quarterback Eli Manning as Atlanta Falcons cornerback Robert Alford defends during the second half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Seth Wenig)

New York Giants wide receiver Odell Beckham celebrates after scoring on a touchdown pass from quarterback Eli Manning during the second half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Seth Wenig)

New York Giants defensive tackle Johnathan Hankins (95) sacks Atlanta Falcons quarterback Matt Ryan (2) during the second half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Kathy Willens)

New York Giants defensive tackle Johnathan Hankins, left, and strong safety Antrel Rolle celebrate after Hankins forced a fumble from Atlanta Falcons quarterback Matt Ryan during the second half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. (AP Photo/Bill Kostroun)

Atlanta Falcons quarterback Matt Ryan, bottom, lays on the grass after being sacked by New York Giants defensive tackle Johnathan Hankins (95), partially obscured, during the second half of an NFL football game, Sunday, Oct. 5, 2014, in East Rutherford, N.J. The Giants won 30-20. (AP Photo/Seth Wenig)

Rashad Jennings suffered an injured knee that kept him out of action during the second half of Week 5, so Williams has become a must-add running back across the board. The rookie out of B.C. looked solid in Jennings' absence, rushing for 65 yards with one touchdown and 14.30 fantasy points in a win over the Atlanta Falcons. Williams would be a viable No. 2 fantasy runner if Jennings were forced to miss Week 6.