Martin Keown fears Arsenal’s FA Cup fifth round win over Mansfield could come at a major cost after Mikel Arteta’s side were pushed all the way by their League One opponents.

The Gunners made nine changes to their starting line-up following Wednesday’s angsty win at Brighton which saw their lead at the top of the Premier League extend to seven points.

A makeshift line-up struggled to adapt to a new formation on a boggy One Call Stadium pitch and it took until shortly before half-time for Noni Madueke to break the deadlock.

Rather than representing the launchpad for a routine victory, Arsenal failed to kick on and were rocked just five minutes after the restart when Will Evans pounced on a Marli Salmon mistake, roarded beyond Cristhian Mosquera and pulled his side level.

With the tie in the balance, Arteta made further changes and his substitutions ultimately paid dividends when Eberechi Eze fired home from the edge of the penalty area.

The visitors saw out the remaining period of the game relatively comfortably and will now move on to an altogether different test when they face Bayer Leverkusen in midweek.

Arteta is, however,...