The Dragons followed up a 3-0 friendly defeat to England with a goalless draw against Republic of Ireland at the weekend, though they remain in control at the top of Group B4.
A stalemate in Dublin is certainly not the worst result on the face of it for Ryan Giggs, especially as it means his side keep hold of top spot at the midway stage of the campaign, albeit now just one point better off than Finland.
Wales offered very little in an attacking sense, however, which has been the theme throughout their four matches this calendar year.
It took late goals to see off Finland and Bulgaria in last month's opening two UEFA Nations League fixtures, but there was no way through against England nor Republic of Ireland.
Ultimately, though, Giggs can be pleased with his side's results over the past 18 months, having lost just once in their last 10 matches - the friendly defeat against an experimental England at Wembley last week.
Another victory away to bottom side Bulgaria on Wednesday will ensure that the Dragons remain well-placed to earn promotion to Group A.
Georgi Dermendzhiev's charges have lost back-to-back UEFA Nations League games without scoring, going down 1-0 to Wales in Cardiff and 2-0 away to Finland last time out.
That followed a 1-1 draw at home to Republic of Ireland in their opening fixture, with Shane Duffy snatching a last-gasp point for the visitors.
In fact, it is now six games without a win for Bulgaria in this competition when including fixtures from the last campaign.
Overall, the Lions have won just one of their last 18 matches, losing the last three of those, so Wales will undoubtedly head into this contest as the favourites.
With a couple of home games to see out their Group B4 campaign next month, Giggs's men have a real chance to tighten their grip on top spot, while at the same time sending Bulgaria closer to relegation.
Bulgaria Nations League form: DLL
Bulgaria form (all competitions): WLDLLL
Wales Nations League form: WWD
Wales form (all competitions): WWWWLD
Kieffer Moore was declared fit to play against Republic of Ireland, despite injuring his toe versus England, but he is suspended for this match after picking up another yellow card.
David Brooks got some minutes under his belt as a second-half substitute at the Aviva Stadium but has since been ruled out with a hamstring problem, while Gareth Bale and Aaron Ramsey are also absent.
Bulgaria made eight changes between their Euro 2020 qualifying playoff defeat to Hungary and the 2-0 loss to Finland, and Dermendzhiev is likely to rotate again for this game.
Bulgaria possible starting lineup:
Lukov; Popov, Dimitrov, Bozhikov, Velkovski; Tsvetkov, Malinov; Despodov, Iliev, Yomov; Kraev
Wales possible starting lineup:
Hennessey; N.Williams, Ampadu, Rodon, Davies; Matondo, Vaulks, Levitt, James; J.Williams; Roberts
We say: Bulgaria 0-2 Wales
Wales have looked a little disjointed in their latest set of fixtures, clearly not helped by a quick turnaround in games and the absence of their undisputed star player.
This trip to Sofia presents the visitors with a chance to get back to winning ways and take a step closer to promotion, however, and we cannot see past a routine away victory.