The Weston-super-Mare-based official will travel to Kenilworth Road for his eleventh game of the campaign and his fifth in Sky Bet League One.
His first game of the campaign was Bradford City's slender 1-0 win at Shrewsbury Town where he issued three yellow cards. Meanwhile, his latest encounter came on September 29th when he showed six cautions in Doncaster Rover's 3-2 away win at Plymouth Argyle.
He's taken charge of the Iron on four occasions in total, most recently in November 2017 when the side beat Charlton Athletic 2-0 at Glanford Park with two wonder strikes from Josh Morris in the space of three second half minutes. On that night, he issued three cautions.
The encounter at Kenilworth Road will be his fifth involving United and third away from home. In the four games refereeing Scunthorpe, he's issued 16 yellow cards and no red.
Meanwhile, he's refereed Luton Town on 14 occasions - their most recent being 2-1 home win against Mansfield Town back in April when he issued six cautions. In total, he's shown 39 yellow cards and three reds in the 14 Hatters games he's been involved in.
In 2017-18, he took charge of 37 games, issuing 111 yellow cards and nine reds. So far in this campaign, he has officiated in ten encounters, showing 32 yellows and no reds.
On Saturday, Johnson will be assisted by Christoper Kidd and Gregory Read, while Hristo Karaivanov has been appointed as the fourth official.
PAST SCUNTHORPE ENCOUNTERS
| DATE | COMP | MATCH | Y | R |
| Nov 25, 2017 | LG 1 | Iron 2-0 Charlton Athletic | 3 | 0 |
| Sep 26, 2015 | LG 1 | Southend United 2-1 Iron | 4 | 0 |
| Apr 11, 2015 | LG 1 | Iron 2-1 Crawley Town | 3 | 0 |
| Feb 10, 2015 | LG 1 | Coventry City 1-1 Iron | 6 | 0 |
PAST LUTON TOWN ENCOUNTERS
| DATE | COMP | MATCH | Y | R |
| Apr 2, 2018 | LG 2 | Luton Town 2-1 Mansfield Town | 6 | 0 |
| Aug 12, 2017 | LG 2 | Barnet 1-0 Luton Town | 3 | 0 |
| Aug 23, 2016 | LGEC | Luton Town 0-1 Leeds United | 3 | 0 |
| Feb 17, 2015 | LG 2 | Mansfield Town 1-0 Luton Town | 2 | 0 |
| Mar 11, 2014 | CONF | Cambridge United 1-1 Luton Town | 3 | 0 |
| Jan 1, 2014 | CONF | Luton Town 2-1 Barnet | 0 | 0 |
| Aug 31, 2013 | CONF | Kidderminster Harriers 0-2 Luton Town | 5 | 0 |
| Apr 1, 2013 | CONF | Luton Town 1-2 Kidderminster Harriers | 2 | 0 |
| Feb 23, 2013 | CONF | Luton Town 2-3 Mansfield Town | 1 | 0 |
| Dec 26, 2012 | CONF | Luton Town 3-1 Woking | 0 | 0 |
| Oct 27, 2012 | CONF | Forest Green Rovers 1-2 Luton Town | 5 | 1 |
| Aug 14, 2012 | CONF | Kidderminster Harriers 0-2 Luton Town | 4 | 0 |
| Jan 10, 2012 | CONF | Luton Town 1-0 Stockport County | 0 | 0 |
| Aug 11, 2009 | CONF | Luton Town 4-1 Mansfield Town | 5 | 2 |
