[4] He entered the ownership of Charles St George and was sent into training with Henry Cecil at the Warren Place stable in Newmarket, Suffolk.
[4] After a break of over two months, Lanfranco was moved up in class for the Group One William Hill Futurity over one mile at Doncaster Racecourse.
Ridden by Lester Piggott he was made the 100/30[5] third favourite behind the French-trained River Drummer (runner-up in the Grand Critérium) and the Harwood-trained Sabona, whilst the other eight runners included Damister and Highfire (first and second in the Somerville Tattersall Stakes) as well Brave Bambino (third in the Seaton Delaval Stakes) and Northern River, who had beaten Sabona at Newbury.
[4] On his first appearance as a three-year-old, Lanfranco started 10/1 third favourite for the 2000 Guineas at Newmarket on 4 May but looked completely outpaced and finished seventh of the fourteen runners behind Shadeed.
After his connections opted to bypass the Irish Derby, Lanfranco was matched against older horses for the first and only time in the Princess of Wales's Stakes at Newmarket on 9 July.
As in his previous season, the experience of racing on firm ground resulted in injury, with Lanfranco suffering a "jarred shoulder" which kept him off the course for two months.
[8] On his final appearance Lanfranco contested the St Leger Stakes over fourteen and a half furlongs at Doncaster on 14 September.
He started the 85/40 second favourite behind his stable companion Oh So Sharp, a filly who was bidding for a Triple Crown after winning the 1000 Guineas and the Oaks Stakes.
[8] In the official International Classification of European two-year-olds for 1984, Lanfranco was rated on 75, nine pounds behind the top-rated Kala Dancer, and four behind River Drummer whom he had defeated decisively at Doncaster.