Courtney Senior made his Football League debut on Tuesday night as Wycombe Wanderers lost for the first time in 12 matches following a 2-0 defeat at home to Plymouth Argyle.
The Pilgrims netted through Lewis Alessandra and Peter Hartley in the first-half to consign Wycombe to a first defeat of 2015.
17-year-old Courtney was a 65th minute substitute for Gareth Ainsworth's side, joining fellow Brentford loanee Alfie Mawson on the pitch for The Chairboys.
As it was the pair were unable to help mount a comeback as Wycombe slipped to third in the table, two points behind league leaders Shrewsbury Town.
On Monday night Will Grigg's MK Dons suffered a set-back to their automatic promotion hopes with a 2-1 defeat away at Bradford City.
The Dons took the lead nine minutes after the break through Dele Alli but Bradford instantly levelled through Bill Clarke.
James Hanson scored the decisive goal with 20 minutes to go, three minutes before Will was introduced as a late substitute.
The Dons couldn't find a way back into the game and remain a point behind second-placed Swindon Town and three ahead of fourth placed Preston North End.
Also in Sky Bet League One this week Jack O'Connell nearly inspired a great Rochdale comeback away at Walsall.
The visitors found themselves 3-0 down inside 22 minutes before Jack was introduced as a 25th minute substitute.
Dale pulled one back through Peter Vincenti ten minutes into the second-half and reduced the arrears even further eight minutes later as Ashley Eastham struck.
However the Johnstone's Paint Trophy finalists held on to leave Dale four points off the play-off places with two games in hand.
In the Vanarama South Tyrell Miller-Rodney played an hour as Boreham Wood climbed back to the top of the table after a 3-0 win away at Farnborough Town.
Tyrell's replacement on the hour Graeme Montgomery opened the scoring nine minutes later and the result was put beyond any doubt after late goals from Junior Morias and Lee Angol.
The win leapfrogged Wood above Bromley and into top spot but the second-placed side do have three games in hand.
Montell Moore played 45 minutes on Tuesday as FC Midtjelland's Under-19s beat AaB Under-19s 2-1.
The attacking midfielder, who joined the Danish outfit in January, saw his team take the lead in the ninth minute through Mikkel Fran Koch and that advantage was double four minutes before the break through Babajide David.
AaB pulled one back in the second-half as Kasper Chess got on the scoresheet but FCM held on to secure the win.