Aubameyang sealed a last-minute free transfer move to FC Barcelona after being outcasted at Arsenal last month.
A potential loan deal for the Gabon striker appeared set to collapse earlier in the day but it was revived with Aubameyang reportedly accepting a pay cut.
Aubameyang flew to Barcelona to complete the formalities although neither club officially announced the deal yet given he has joined as a free agent. Barca are expected to announce the deal on Tuesday morning local time.
Everton had a busy deadline day, confirming the appointment of Frank Lampard as manager before securing the signatures of Alli from Tottenham along with Donny van de Beek from Manchester United.
England international midfielder Alli joins the Toffees on a two-and-a-half-year contract after struggling for regular game time at Spurs.
Van de Beek never found his feet after a big-money move to Old Trafford in 2020 and joins Everton on loan for the remainder of the season.
Eriksen also joined newly promoted Brentford as a free agent after exiting Inter MIlan in December following his cardiac arrest at Euro 2020.
North of the border, Ramsey made a shock move to Rangers on loan from Juventus for the rest of the season.
In other moves, Newcastle United landed both Dan Burn and Matt Targett, capping off their busy transfer window following the signings of Chris Wood, Kieran Trippier and Bruno Guimaraes.
Tottenham also had a frantic deadline day, letting Giovani Lo Celso, Tanguy Ndombele and Bryan Gil exit on loan to Villarreal, Olympique Lyon and Valencia respectively.
Spurs also drafted in Dejan Kulusevski and Rodrigo Bentancur from Juventus, with the former joining on an 18-month loan, while Juve picked up Denis Zakaria from Borussia Monchengladbach.
River Plate’s young Argentine Julian Alvarez joined Manchester City, while Barcelona held on to Ousmane Dembele amid talk of a move away to PSG. Jesse Lingard also remained with Manchester United.