Antonio joined the Hammers at the end of the summer transfer window for a reported fee of around £7 million from Nottingham Forest, and has taken to the Premier League like a duck to water.
The 26-year-old, who had never played in the top flight before this season, scored his eighth league goal of the season in his 26th appearance in the 2-1 defeat to Stoke City in Sunday's final fixture.
Antonio had superb pedigree at Championship level, having scored 14 goals in 46 appearances for Forest last season and four in his first five in all competitions for the East Midlands club this campaign.
Despite being overshadowed by the more illustrious signing of Dimitri Payet at Upton Park, the winger has taken that form into the top flight, and Crooks has been hugely impressed with what he has seen.
The pundit told BBC's Final Score: "He's been outstanding this season, what a find. He came from Forest, and has settled in the Premier League very well.
"[He's got nine goals] but think of where he's played. He's played in an advanced position and scored goals, he's played at right-back. He's outstanding, he's had an outstanding season. He took his goal exceptionally well today."
Antonio was initially seen as something of a gamble by many West Ham fans when he joined on 1 September, but he has gone a long way to proving that he was worth the relatively inflated price tag for the second-tier player.