Forward: Alexis Sanchez (Arsenal and Manchester United)

Sanchez was arguably last season's biggest flop. The Chilean superstar joined the Reds from Arsenal on January and during the last season, he registered only 3 goals and 5 assists in 18 appearances.
According to the statistics, during the 2017-18 campaign, Sanchez, both as an Arsenal and United player, averaged 1.6 shoots (career lowest in Premier League) and a 74.25% pass accuracy (second career lowest in Premier League). Furthermore, he recorded 1 goal per 693 minutes as a Manchester United player last season.
Last season, Sanchez created only 10 big chances for his Arsenal and United teammates while his shooting accuracy never exceeded 40%.
Forward: Kelechi Iheanacho (Leicester City)

Iheanacho arrived for Leicester from Manchester City for a fee of €27.7 million on August 2017. However, he failed to justify both the price tag and the expectations around his talent.
The Nigerian striker made 30 appearances for the Foxes, scoring 9 goals and making 4 assists. He recorded a 38% shooting accuracy, created only 4 big chances for his teammates and had a conversion rate of just 20%. Clearly, Leicester expects much more from the young player.
Forward: Luciano Vietto (Atletico Madrid and Valencia)

Vietto spent the second half of the 2017-18 season on loan to Valencia from Atletico Madrid. During the whole of the past campaign, the Argentinian managed to register only 5 goals and 1 assist in 29 appearances for Atletico and Valencia.
As a result, the Bats decided against making the loan move permanent and Vietto moved, again on loan, to Fulham.