Winger Townsend has joined the Lions on loan from Tottenham until the end of the season and goes straight into the squad to face the Championship leaders.
Centre-back Purse is unavailable as he starts a two-match ban after picking up his 10th yellow card of the season in the 1-0 defeat at Watford on Saturday, while on-loan Hoops midfielder Rowlands is ineligible to face his parent club.
Winger Hameur Bouazza missed out against the Hornets after picking up a knee injury in training and is still a major doubt.
Striker Josh McQuoid will be hoping to feature after returning to the squad at the weekend following a month out with an ankle injury.
Midfielder Jimmy Abdou is out until at least mid-April with a knee problem, while defender Jack Smith (thigh) and striker Shaun Batt (knee) are still sidelined.
Source: PA
Source: PA