Celtic's 5-0 thrashing of Rangers on Sunday sealed a seventh straight Scottish Premiership title for the green-and-white side of Glasgow.
Gerrard also faces the challenge of outfoxing his former manager at Liverpool in Celtic's Brendan Rodgers.
The arrival of the former England captain will restore some star power to a league that has found it increasingly hard to attract and hold on to top players against the booming television revenues of the Premier League.
Rangers are still recovering from the fallout of their liquidation in 2012 and subsequent demotion to the fourth tier of Scottish football.
In their second season back in the top flight, Rangers trail Celtic by 13 points, and are locked in a battle with Aberdeen and Hibernian just to finish second.
Rangers fans excited by the prospect of Gerrard's arrival have cited his stature as aiding the Ibrox club's ability to recruit a better quality player in what is expected to be a busy transfer window.
But Rangers still have to overcome a huge financial disparity with Celtic. Bolstered by revenue from the Champions League, Celtic's £90 million ($122 million) turnover last year was three times that of their Old Firm rivals.
Betting on an inexperienced manager with no previous ties to Scottish football is also seen as another huge risk taken by Rangers' beleaguered board.
Caretaker manager Graeme Murty, who had been promoted from his role as the club's under-20 coach, was sacked this week after six months in charge.