Robert Glatzel scored 24 goals for Heidenheim in two seasonsFollow live text coverage from 12:00 BST on Saturday
Cardiff could hand a debut to £5.5m German forward Robert Glatzel, who missed their opening-day defeat at Wigan through suspension.
Goalkeeper Neil Etheridge (hamstring) misses out and is set to be replaced by second-choice keeper Joe Day.
Luton defender Dan Potts is a doubt after injuring his shoulder in their draw against Middlesbrough.
Brendan Galloway and Jacob Butterfield are pushing for starts, with Danny Hylton among those back in training.
Match facts
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Cardiff City haven't faced Luton Town in a league match since drawing 0-0 in a Championship meeting on New Year's Day 2007.
This will be Luton's first-ever visit to the Cardiff City Stadium - their last away league trip to Cardiff was in September 2006, losing 4-1 at Ninian Park.
Neil Warnock has never lost in the Football League against Luton in nine games against the Hatters (W3 D6 L0), only facing Rotherham United more often without losing (17 games).
Cardiff lost their opening game of the season away at Wigan (3-2) - Warnock has never previously lost his opening two games of a second-tier league campaign, with 2019-20 being his 15th season in charge of a club at this level.
Luton striker James Collins has scored 45 league goals for the Hatters - 16 more than any other teammate since the start of the 2017-18 season.
Source: bbc.com