The Bundesliga record champions hardly seem to need more attacking potency, but the football adage that if you stand still you actually go backwards has never been one that could be used to define Bayern's approach.
In Gnabry, the 2016/17 title winners have added one of the most eye-catching of performers from the last campaign to their ranks, and bundesliga.com has taken a look at where the Werder Bremen man will fit in.
Attacking Midfield in a 4-2-3-1
Gnabry's ability and pace mean he could play in any one of the three positions behind Robert Lewandowski. However, his nose for goal and ability to create chances for others - he made nearly a century of opportunities for Bremen team-mates last season - will make him a valuable asset in a central role in the 4-2-3-1 formation that worked best for the team last season. His goal threat will be a bonus as he bulks up the creativity through the middle of the park that was almost exclusively Thiago Alcantara's remit in 2016/17. Gnabry is more naturally suited to the position further up the pitch, enabling Ancelotti to employ Thiago in a deeper role, where he can serve more effectively as the link between defence and attack.
@sergegnabry is on the move. The offensive player is making his way south to join #Bundesliga champions @fcbayern. . Serge Gnabry ist auf dem Weg. Der Angreifer von Werder Bremen wechselt zum Rekordmeister Bayern München! #FCB #FCBayern #Munich #miasanmia #Bundesliga #Football #Soccer #Germany #fussball #futbol #goals #lovefootball #thebeautifulgame #instasport #team #soccerislife #footy #skills #matchday #player #match #footballgame #ball
Midfield in a 4-3-3
Gnabry's attacking instincts would make him ill-suited to a holding midfield role. But similar to what he did at Bremen, he could serve effectively as a number 8, shuttling back and forth box-to-box and helping win back possession, but also being able to use the ball to good effect going forward. There is little doubt the Germany international has the legs to carry out the role, while his ability to strike a ball and reading of the game could make him a devastatingly effective late arrival into the penalty area.
Germany boss Joachim Löw likes Gnabry in this position, where his pace - he had the choice of pursuing football or athetics as a youngster - is a major asset. However, in Kingsley Coman and Douglas Costa, Ancelotti already has more than adequate alternatives to Franck Ribery and Arjen Robben, who appear to have the Bayern boss' favours. Nevertheless, Gnabry will provide a further, credible option.
Watch: Gnabry's new team-mate, Robert Lewandowski, doing what he does best.
Attacker in a 4-3-3
Bayern have goals virtually throughout the team, but Lewandowski undeniably remains their main source. The Poland international's flawless training and personal regimen means he is rarely in the treatment room, but he turns 29 in August, and with 30 Bundesliga goals last term, he was responsible for just over a third of the champions' tally. It is a weighty ratio, and with his advancing years, Bayern are no doubt in need of alternatives.
Cue Gnabry. Though he may not be an out-an-out striker, he showed last season that in scoring 11 goals for Bremen, the majority of which were netted in the Green-Whites' miserable Hinrunde, that he has formidable finishing skills. If he can find the net in a struggling team, Bayern fans must be drooling at the prospect of what he could do in theirs. He is perhaps still a little raw to feature as a 'false nine', and having just turned 22, may still need to develop the game awareness required of a leader of the line. But in a wide position across a front three, he could be devastating.