Solid-state high-harmonic generation (s-HHG) is intrinsically sensitive to the phase of interband wave packets, yet in conventional midinfrared (MIR)-driven schemes, carrier injection, acceleration, and emission occur within a single optical cycle. Here we introduce a resonant attosecond injection scheme in which a weak, finite-bandwidth attosecond pulse prepares a phase-defined interband coherence over a finite distribution of crystal momenta at a controlled time within the MIR waveform. We show that resonant attosecond injection reshapes the harmonic spectrum in the weak-field regime, enhancing the first plateau and activating a higher-energy multiband channel. The injected coherence also produces momentum-resolved population fringes and corresponding structures in the $k$-resolved s-HHG current source. For the weak MIR field considered here, the dominant Fourier branches remain close to the field-free interband energy separations, while weaker parallel branches arise from MIR-induced modulation. These results demonstrate that resonant attosecond injection provides a controlled way to prepare and probe band-gap-sensitive multiband dynamics in s-HHG.

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• Band gap
• High-order harmonic generation
• Light-matter interaction
• Nonlinear optics
• Ultrafast phenomena