Giroud, signed from rivals Arsenal in January to provide competition for Morata, has been the better option for the Blues in recent months.
After netting four times in his last seven outings, including in the 2-0 semi-final win against Southampton, the France international is likely to get the nod on Saturday evening.
With that in mind, Sports Mole looks at Giroud's record against United with Arsenal and Chelsea.
Giroud has already had experience of playing against the Red Devils while wearing the blue of Chelsea, having been brought on for the final 12 minutes of February's 2-1 loss at Old Trafford.
That was one of six defeats in 11 Premier League meetings with United, scoring in just two of those - a 2-1 loss in 2014-15 and 1-1 draw at the Theatre of Dreams last season.
The 31-year-old has better memories of facing United in the FA Cup, though, as he was a part of the Arsenal side that won 2-1 in the quarter-finals 14 months ago, albeit as a late substitution.