The Neapolitans are currently third in the Serie A table, six points behind the pacesetters and reigning champions Internazionale.
They progressed through their Europa League group prior to Christmas, eliminating Leicester City in the process, and now face a mouthwatering two-legged tie against Barcelona next month for a place in the competition’s round of 16.
Axel is the third United defender to agree a loan move this week, with Teden Mengi temporarily joining Birmingham City and Ethan Laird switching from Swansea City to promotion-chasing AFC Bournemouth.
Meanwhile, Will Fish – another centre-back – has been recalled after his stint with non-league Stockport County.
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