Arsenal manager Mikel Arteta is facing a pleasant selection headache as key defender William Saliba returns to full training after a lengthy injury absence. The French international has been sidelined since suffering a back injury during France's World Cup semi-final defeat to Spain in December, but his comeback presents Arteta with a welcome problem: how to fit him back into a defense that has excelled without him.

Saliba's Importance

Saliba, 25, was instrumental in Arsenal's Premier League title triumph last season, forming a formidable partnership with Gabriel Magalhaes that conceded just 27 league goals. His performances earned him a fourth consecutive PFA Team of the Year selection. However, a back issue that had been managed throughout the campaign flared up at the World Cup, necessitating an extended rehabilitation period without surgery.

Konsa's Seamless Integration

In Saliba's absence, summer signing Ezri Konsa has stepped up impressively. The £55m arrival from Aston Villa has started seven of Arsenal's nine league matches, helping the Gunners concede just five goals and climb to the top of the table. Konsa's partnership with Gabriel has been so solid that some pundits are calling it the best defensive duo in world football. Arteta has described Konsa's adaptation as "unbelievable."

The Selection Puzzle

With Saliba now fit, Arteta must decide how to accommodate three top center-backs. One option is to shift Konsa to right-back, a position he has filled for England, allowing Saliba to resume his usual role alongside Gabriel. That would mean less playing time for Ben White and Jurrien Timber, who have shared right-back duties this season. Alternatively, Arteta could rotate his defenders given the congested fixture list, with Arsenal competing on multiple fronts.

Saliba's return also impacts young defender Cristhian Mosquera, whose limited minutes may raise questions about his future. However, with Arsenal aiming to defend their title and make another deep Champions League run, squad depth will be crucial.

What's Next?

Arsenal host Hull City on Saturday before the international break, giving Saliba more time to build fitness. Arteta will be cautious with the defender, but once he is fully match-fit, the manager will have to make tough choices. It's a dilemma every top coach would envy, and one that could define Arsenal's season.