It's a connection that will be seamless, but now the task for the veteran is getting up to speed with Chargers Offensive Coordinator Greg Roman’s offense with under a month until Week 1.
"The playbook kind of looks the same. Just different terminology. Obviously, [Roman] is going to call it different than the last guy I was with. It'll probably feel different."
"I think it'll be pretty quick. It's really the same plays," Allen later added. "Every coordinator has the same plays, they just call it different things. You just have to learn the reasons, splits and how they like to do it and kind of transfer the last play to this play and make it make sense."
Another part of catching up is getting to know the new faces, especially in the wide receiver room, in the mix after a year away.
That includes the young wide receiver that broke his single-season rookie records last season in Ladd McConkey.
Allen said he kept tabs last season and was well aware of the season McConkey had. When asked about the receiver breaking his records, the veteran praised the 23-year-old — while also joking around in the process.
"He had a little bit more games," Allen said with a laugh.
"It was great. He's a great player," Allen added. "Elusive, fast, he made a lot of plays."
Allen said he hadn't had a chance to talk with McConkey yet but knows what he brings to the table.
It's why he's not worried at all about the fit between himself and the second-year receiver, however the alignment shakes out.
Both Allen and McConkey have done their damage from the slot, bringing up the question of how the two will complement each other on the field.
But at the end of the day, Allen says as long as you have players that can produce, they'll figure it out.
"You got two guys that know how to play football, love to play football and compete," Allen said. "I think you can put us anywhere. I'm a guy who can be anywhere on the field and obviously he showed last year he can do it all, too.
"Figuring it out, coming up with a game plan and letting them figure that out," Allen added.