Southampton boss Ronald Koeman believes Alexis Sanchez's fitness is key to Arsenal's title chances.
Sanchez is expected to make his first Premier League start since November against Koeman's Saints on Tuesday night, after making a goal-scoring comeback in Saturday's 2-1 FA Cup win over ChampionshipBurnley.
The Dutchman said: “Sanchez is back and that is for them a big player who will be very important for the last part of the season.
“He's one of the players who is difficult to stop because they have so high qualities. He's fast. Technically, he's perfect.
“They have more players, very good midfield players. They have Ozil. They have so many possibilities and players with really high quality. That's Arsenal, and that's why Arsenal is fighting to win the title."
