Not necessarily, at the start of the summer the plan was to pair Keita and Coutinho up in the same side. Yes we are after Lemar but he could be coming to bolster our options out wide.
Jurgen obviously likes to have pace on both flanks and Mane and Salah can't possibly play every game especially given the style and intensity of our play (they'd be burnt out by November). We have no one really outside of Origi, Kent and Ojo that could come in and do a similar job so Lemar could be brought in to share the workload.
Jurgen said himself that the reason we looked better defensively yesterday was because Mane and Salah both got back to defend, our wide forwards are going to have to get through a Herculean amount of work this season if we are to be successful so we are going to need more that 2 pacey wide players. The Lemar signing makes perfect sense when you think about it.