Jerry Jones, the owner and general manager of the Dallas Cowboys, officially announced Mike McCarthy as the team's first head coach since Jason Garrett did so in 2012 on Wednesday. McCarthy will run a variation of the West Coast offence he ran with the Green Bay Packers from 2006 to 2018, according to Jones. At the Senior Bowl in Mobile, Alabama, Jones told reporters, "This is the obvious move to expand on it and use what we've developed, if you will, as the foundation of the stuff we've got." "Now is the time to expand upon it." This is a phase in the construction process. Dak Prescott, the Cowboys quarterback, will experience his first system change in his career.The Cowboys ran variations of the same offence from 2016 to 22 with various playcallers, first Scott Linehan (2016–18) and then Kellen Moore (2019–22). It will essentially be how he conducted himself in Green Bay, which changed, I'm sure he'll tell you, Jones said. Moore and the Cowboys mutually decided to split ways, and he soon accepted a position as offensive coordinator with the Los Angeles Chargers. Speaking to reporters in Mobile, executive vice president Stephen Jones alluded to the disagreements between McCarthy and Moore that resulted in their separation.Thomas Brown, the tight ends coach for the Los Angeles Rams, and Jeff Nixon, the associate head coach and offensive coordinator for the Carolina Panthers, according to Jerry Jones, were both interviewed by the Cowboys for the coordinator position. According to a source, Mike Solari, a seasoned offensive line coach, will replace Joe Philbin with the Cowboys. He spent the previous four seasons as the line coach for the Seattle Seahawks after working as an assistant offensive line coach under McCarthy in Green Bay (2015). McCarthy still has to fill a couple slots on defence as well as the quarterback and running back coach positions on offence. Doug Nussmeier, the former coach of the Dallas quarterbacks, announced his resignation on Sunday night.