I really don't understand why Chelsea brought back Lampard as interim manager, because previously Lampard was sacked and then Chelsea replaced him with Tuchel. With Chelsea's previous dismissal, this should have proven that Lampard cannot be expected too high.
There are other reason behind the re-appointment of Frank Lampard to take up this job at this time, Chelsea right now is in a critical state, where if they miss out on this Champions League there will be no champions league for the club next season and Frank Lampard happens to be the only coach that got the experience of what Chelsea is facing right now in the champions league during when Chelsea was sometime in this kind of condition during Frank Lampard time as player in Chelsea.