The Everton boss is under increasing pressure following a disappointing campaign.
Roberto Martinez must the FA Cup to save his job as Everton manager, Garry Monk told TalkSPORT on Friday.
Martinez is under mounting pressure, despite leading the Toffees to semi-finals of both domestic cups this season.
However, their league form continues to fall below expectation and a second successive bottom-half finish beckons.
Monk though, who was Martinez's captain at Swansea and later succeeded him as manager at the Liberty Stadium, believes ending the campaign on a high will dilute calls for the Spaniard's head.
"Of course (he needs to win the FA Cup)," Monk replied after being posed the question by TalkSPORT host Alan Brazil. "As a manager in those situations you need a strong end to the season.
"The cup's a big, big target for them now - having a strong finish will dampen down the talk (of his sacking)."
One of the most popular gripes among Everton supporters is Martinez's inability to rectify the team's defensive failings, with the Toffees the Premier League's joint-fifth top scorers this season.
Monk, however, insists his old mentor will work flat-out to turn things around at Goodison Park.
He added: "Roberto's a very good manager, he'll be working tirelessly for Everton and he's a good man for the job."
Martinez won the FA Cup three years ago as Wigan manager, ironically knocking out Everton en route, but took the Latics down the following week.
The Toffees need a maximum of six points to guarantee their survival this season.