Martin Keown has warned William Saliba and Gabriel Magalhaes that they ‘can’t make mistakes’ ahead of Arsenal’s clash against West Ham.

Saliba and Gabriel have formed an impressive partnership at Arsenal over the last few seasons in the heart of Mikel Arteta’s defence.

But Keown has suggested that ‘top draw’ centre-back Cristhian Mosquera could replace one of the two defenders if either of them drop their level.

Arsenal signed Mosquera from Valencia in the summer transfer window and Keown feels the 21-year-old star is a huge upgrade on Jakub Kiwior.

Speaking on TNT Sports before the Gunners host West Ham in the Premier League on Saturday, Arsenal icon Keown said: ‘Mosquera, the new acquisition, he’s really top draw.

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‘He has the same DNA as

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