KEY MAN: Garth Crooks has hailed Alexis Sanchez

The Chile forward has been a revelation for the Gunners since joining from Barcelona in 2014.

He opened the scoring in Saturday's 3-0 win against Chelsea after robbing the ball from Gary Cahill and cooly slotting past Thibaut Courtois.

It was his 47th goal in 100 appearances for Arsenal, just one fewer than record scorer Thierry Henry managed in the same period.

Despite Mesut Ozil and Santi Cazorla also sparkling against the Blues, former Tottenham striker Crooks believes Sanchez is the main man.

Crooks included Sanchez in his BBC team of the week and said: "At the risk of sounding treacherous to my former club Tottenham, if Arsenal can manage to keep Sanchez, Mesut Ozil and Santi Cazorla on the field and at the same time, Arsenal must be in with a chance of winning the title.

"Sanchez is the most important member of the trio as far as I am concerned.

"Keep Sanchez fit and present him with sufficient goalscoring opportunities and the Chile international is very capable of bringing Arsenal the trophy that has eluded Arsene Wenger for some considerable time.

"The thought is enough to give Spurs fans nightmares."