5 million isnt much, you can try and get a CB or GK on loan and then spend the majority of your budget on a permanent player for the other positions, my suggestions would be:
GK: Seculin, Areola, Boucher
CB: Varane is probably too expensive for you so try and get an older stop-gap, Woodgate can be free if you wanna risk the injuries, plus Sol Campbell is worth a punt for a season.