Arsenal sign Valencia defender Shkodran Mustafi for more than £35m and Deportivo La Coruna forward Lucas Perez for £17.1m.
Arsenal have completed the signing of Germany international defender Shkodran Mustafi from Valencia.
Premier League side Middlesbrough sign Arsenal defender Calum Chambers on a season-long loan deal.
Celtic sign Costa Rica right-back Cristian Gamboa on a three-year deal from Premier League side West Brom.
David Luiz could be set for a stunning return to Chelsea with the Premier League club offering £30m plus add-ons to PSG, according to Sky sources.
Watford sign Chelsea's Kenedy on a season-long loan deal and re-signed defender Adrian Mariappa on a three-year deal.
Porto defender Bruno Martins Indi will have a medical at Stoke City on Wednesday ahead of a loan move, according to Sky sources.
Crystal Palace sign France striker Loic Remy on a season-long loan deal from Premier League rivals Chelsea.