When it rains at Villa Park, it pours.Aston Villa boss Unai Emery fears Ian Maatsen faces a ‘long, long time’ on the sideline after he suffered an ankle injury in the 2-1 loss to Nottingham Forest.Maatsen had established himself as Villa’s starting left-back following Lucas Digne’s departureGettyMaatsen was scythed down by Forest’s James McAtee in the 80th minute but could not continue.Unfortunately for Villa, they had made all of their substitutions, so they could not replace the Dutch left-back.It meant John McGinn, who began the match at right wing, had to moonlight as a makeshift left-back.In a brutal twist, Forest’s winner came down that side as Daniel Munoz’s cross was deftly flicked on by Morgan Gibbs-White to Igor Jesus, who swept home from close range.Unai Emery gives worrying update on Ian Maatsen’s injurySpeaking after the contest, Emery conceded he did not have a concrete update on Maatsen’s injury.“But the information I have, an ankle injury, it may be a long, long time,” Emery said.The Villa boss was also frustrated that McAtee was allowed to remain on the pitch.“The tackle, it was one for VAR,” Emery continued.“I think VAR should call the referee to watch it and show a red card.“We finish with 10 men and they finish with 11.”Emery’s side are now winless in their opening four league fixturesGettyWorryingly, Maatsen wasn’t the only Villa starter who picked up an injury against Forest.Star centre-back Pau Torres also exited early, coming off in the first half with a hamstring issue.Taylor Harwood-Bellis set for Champions League inclusionThe Spaniard’s injury now looks set to result in Taylor Harwood-Bellis being drafted into Villa’s Champions League squad.Harwood-Bellis joined Villa this summer from Southampton for an initial £25million but was a notable omission from Villa’s 23-man squad for Europe this season.However, the one-time England international now looks set to be jettisoned into Villa’s Champions League list.Per UEFA rules, a player who has been injured or ill for at least 60 days can be temporarily replaced by a player who was registered with their club before the List A deadline.Torres’ absence will be keenly felt due to his importance in Villa’s build-up playGettySpeaking on Harwood-Bellis, who was not included in the matchday squad for the loss against Forest, Emery noted ‘his time is coming after Pau’s injury’.Villa will look to pick up their first domestic win this season next Wednesday when they make the short trip to Coventry City in the Carabao Cup third round.