Llanelli Town are favourites to win the Nathaniel Cars Welsh League title, but they have been rocked by a Football Association of Wales decision.
Llanelli’s application for a domestic licence has been turned down by the FAW and that could open the way for Haverfordwest County to go up.
A Llanelli statement says: “The club will now assess, digest and then appeal the decision.
“We are more than confident in achieving the domestic licence during the appeals process.”
Llanelli have 10 days to appeal and that would be heard on Thursday, April 26.
Haverfordwest have been granted a licence, while Penybont withdrew their application.
County must finish in the top two to keep alive their hopes of going up, while Llanelli need to win their appeal and finish above Haverfordwest to take the lone promotion place available.
Manager Andy Hill and his Llanelli team earned a 4-1 home win against Monmouth Town at Stebonheath in their latest match.
That was their final home game of the season and Llanelli now have five away matches to play.
Lee Trundle’s free-kick struck a Monmouth post before opening the scoring after 28 minutes, cutting inside to firing home.
Monmouth equalised two minutes later when a shot by Rob Laurie rebounded to Lewis Clare and he forced the ball into goal.
The score was 1-1 at half-time and it look some time before Llanelli took command thanks to two late goals.
Jordan Follows scored from an Antonio Facciuto, curling a delightful finish into the top corner from the edge of the area.
Kurtis March saw his effort scrambled off the line when Trundle set up the chance, while Monmouth went close when Clare was put through the middle and forced goalkeeper Craig Morris to run outside of his area and head clear.
The ball fell to Kaz Kareem and the Reds` goalkeeper was forced to drop down and grasp his goal bound shot.
Trundle set up the third when his run took him close to goal before finding March, who steered his finish home from point blank range on 88 minutes.
Three minutes into injury time substitute James Loveridge was picked out wide on the left before despatching a well struck shot into goal.
Llanelli Town: Morris, Vickers, Facciuto, R Thomas (Finselbach 90), C Thomas, Bevan, C Jones (Samuel 82), March, Clarke (capt), Trundle, Follows (Loveridge 71). Subs not used: Morgan, R Jones.
Monmouth Town: Kirkwood, Palmer, Cleaves, Laurie (capt), A Ford, Lewis, E Ford, Kareem (Ellworthy 82), Clare, Flay, Davies. Subs not used: Jones, Brown.
Referee: Jordan Harman (Newbridge).
Attendance: 248.
Llanelli play Cwmbran Celtic in the Nathaniel Cars League Cup semi-final at Afan Lido FC on Tuesday, while they travel to take on Goytre FC next Friday.
Llanelli Town FC remaining fixtures
April
Tuesday 10 v Cwmbran Celtic (League Cup semi-final, at Afan Lido).
Friday 13 v Goytre FC (away)
Tuesday 17 v Goytre United (away)
Saturday 21 v Port Talbot Town (away)
May
Wednesday 9 v Cwmamman United (away)
Saturday 12 v Cwmbran Celtic (away)
Haverfordwest powered to a 3-0 home win against Afan Lido.
The Bluebirds were good value for their victory with Steff Williams (2) and Ryan Thomas the scorers.
Greg Walters, playing at centre-forward, produced a strong, efficient job of competing for ball in the air and picking up team-mates.
Goalkeeper Conah McFenton was safe and solid, while Sean Pemberton did a tight man-marking job on Jack Todd and Tim Hicks was immaculate at sweeper.
Teenage full backs Leon Luby and Alaric Jones both went forward time and again, while new signings Elliot Scotcher and Ryan Thomas slotted in neatly alongside Ricky Watts in midfield.
The next league game for the Bluebirds is against Penybont away on Saturday (April 14).
Haverfordwest County: Conah McFenton; Leon Luby, Alaric Jones, Sean Pemberton, Tim Hicks, Ricky Watts, Steffan Williams, Greg Walters, Ryan Thomas (Joe Pritchard 87), Dan Williams (Charlie Davies 87), Elliot Scotcher. Sub not used: Nicky Palmer, Nick Jones (gk).
Haverfordwest County FC remaining seven fixtures: Ton Pentre (away), Caerau Ely (away), Goytre United (home), Afan Lido (away), Monmouth Town (away), Penybont (away), Taffs Well (away).
Nathaniel Car Sales League Cup semi-finals:
Tuesday, April 10: Cwmbran Celtic v Llanelli Town (Afan Lido FC).
Wednesday, April 11: Pontypridd Town v Trefelin BGC (at Aberdare Town FC).
Welsh League One 2017-2018
| POS | NAME | P | W | D | L | PTS | |
| 1 | Llanelli Town | 25 | 19 | 3 | 3 | 60 | |
| 2 | Penybont | 28 | 16 | 6 | 6 | 51 | |
| 3 | Haverfordwest County | 23 | 15 | 3 | 5 | 48 | |
| 4 | Cambrian & Clydach Vale BGC | 26 | 14 | 2 | 10 | 44 | |
| 5 | Afan Lido | 25 | 14 | 2 | 9 | 44 | |
| 6 | Goytre United | 25 | 11 | 7 | 7 | 40 | |
| 7 | Undy Athletic | 26 | 11 | 4 | 11 | 37 | |
| 8 | Port Talbot Town | 27 | 9 | 9 | 9 | 36 | |
| 9 | Taffs Well | 25 | 10 | 4 | 11 | 34 | |
| 10 | Goytre | 21 | 10 | 1 | 10 | 31 | |
| 11 | Briton Ferry Llansawel | 23 | 8 | 6 | 9 | 30 | |
| 12 | Cwmbran Celtic | 21 | 8 | 4 | 9 | 28 | |
| 13 | Cwmamman United | 20 | 5 | 4 | 11 | 19 | |
| 14 | Monmouth Town | 24 | 5 | 3 | 16 | 18 | |
| 15 | Caerau (ELY) | 22 | 3 | 3 | 16 | 12 | |
| 16 | Ton Pentre | 23 | 1 | 5 | 17 | 8 |
*Penybont deducted 3 points