Shkodran Mustafi:
Mustafi has been a solid part of the defence for the Spanish side this season. In his ten league appearences so far this season, the German has picked up two goals and two man of the match performances. As well as being a formidable player in Valencia's season so far, he has also now become a regular call up for the German national side despite only being 23 years old. He currently has nine caps and a world cup winners medal to his international collection.Mustafi's performances haven't reflected on his sides current form. Mustafi is currently ranked as the 11th best player in Liga BBVA ahead of some very big names including Diego Godin, Sergio Ramos and Andres Iniesta. The German also has the best interceptions per game average in the entire league and is also currently in the leagues team of the season.
Valencia may be ninth but if the rest of the side can follow on from Mustafi's good form, then Neville may have the influence to get back to winning ways.
Jaume Domenech:
With injuries to both vice-captain Diego Alves and Matthew Ryan, Jaume has been given a perfect opportunity to stake his claim in the Valencia first team, and indeed he has. Jaume has kept six clean sheets in his 15 appearences this season. The 25 year old had been predominately playing for Valencia's B team until this season but if he keeps playing the way he is, Alves may struggle to get his number one shirt back.
Domenech is currently 12th in the leagues player rankings putting him above Real Madrid's Keylor Navas. Jaume is also the leagues highest rated goalkeeper on average match rating, making him the current goalkeeper in this seasons current team of the campaign. He also has an impressive 4.1 average saves per game which is the third best in the league.
When Diego Alves returns from injury, the Neville brothers will have a big decision when choosing their main keeper.
Paco Alcacer:
The 22 year old striker currently has six goals and two assists to his name in 12 league appearences, despite only starting seven times. The rising star has also scored twice for his country this season with them both coming in Spain's 4-0 win against Luxembourg during their EURO 2016 qualifying campaign. Alcacer is highly rated in Spain and has scored six times in his 11 caps for his national side.
Alcacer has been Valencia's only fairly prolific striker this season and if he was to be given more starts, he could easily be their next top striker since the days of Roberto Soldado and David Villa. Alcacer also boasts an impressive goals per minute ratio in the Spanish top flight with his average goals coming every 123.8 minutes. A record which is better than both Lionel Messi and Cristiano Ronaldo.
Joao Cancelo:
Cancelo is a 21 year old right back who is looking like he could be a very hot prospect in the near future. Despite Cancelo's young age, the Portugese defender has made 74 youth caps at all levels for his country and has scored four goals in the process. The full back is best known for his tackling and his dribbling and despite not being a household name just yet, he is certainly one to watch.
The Neville's will know exactly what it's like to be a young full back emerging into the first team, and these are arguably two of the best possible coaches for the youngster to be playing under. Out of right backs who have played the majority of the league campaign, Cancelo ranks as the second best in the league putting himself above the likes of Danilo, Juanfran and Dani Alves
Daniel Parejo:
Dani Parejo is one of the better known Valencia players across the European scale. The 26 year old defensive midfielder is the current captain and is well renowned for his long shots and passing contributions. The skipper has had four goals and two assists in his 11 league appearences this season including a man of the match performance against fourth placed Celta Vigo with two goals and two assists.
Despite never representing Spain at full international level, Parejo has scored nine times in 43 appearences within the Spanish youth set-up. Parejo's leadership qualities and all round contributions are going to be key for Gary's side this season and if he gets injured, Valencia's problems will worsen even more.
So there are my five players that have been key so far for Valencia, if Gary Neville can get a whole squad of these determined talents, they should have no troubles of returning to the Champions League.