He said: “He played well [v City]. But there are questions about 90 minutes, and if he can perform over 90 minutes. But we can never know until he plays enough games to be fit enough.”
Gil has made eight appearances in the Premier League this season, scoring one goal, but he has only seen out a full 90 minute game on one occasions - in the 2-0 loss to Chelsea.
The Spaniard possesses one of the best technical abilities in the Villa squad, and the side look much more threatening when he is on the field of play.
New head coach Remi Garde utilised Gil as a starter in his first game in charge, and the 22-year-old lasted 65 minutes of the 0-0 draw with Manchester City.
Collymore was impressed with Gil’s performance against City, but he has admitted that doubts will continue to remain about his inability to see out a full 90 minutes.
It is all well and good having a talented player, but he will hardly have the desired impact for Villa if he cannot play every minute of every game.
Gil needs to be playing regularly to get up to the required match fitness needed for the Premier League, and Collymore wants to see him start to play more and more over the coming weeks to ensure he can perform for 90 minutes.
Villa need to be able to call upon their best players, and Gil has the potential to be a real star for the Midlands side if he can start to prove himself on a more consistent basis.