The Gunners ace has struggled with knee and back injuries but head coach Unai Emery did not play him when fit either citing "tactical reasons".
'He has quality and he can help us with his ambition.
"We are very happy that Denis Suarez is joining us", Emery said.
"I am surprised Emery did not prioritise signing a defender but this move clearly suggests that he wants to improve Arsenal's ability to control games in midfield", Keown told BT Sport. "I think for him it's easy to adapt with us".
Malcom has the feel of a player who would suit Spurs' plans perfectly; versatile, quick, young and with a point to prove after his move to the Nou Camp has not panned out as planned so far.
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And Emery revealed the player has adapted to life in north London "quickly", potentially accelerating his passage into Emery's matchday squad at the first time of asking.
"When they are home for us it is hard". We have four captains, I don't know if you have come to my press conferences but I am going to repeat it but I think the others know it all.
The Spaniard hardly featured for Barcelona in the first half of this season, however, and Smith has claimed that the new arrival will only be "a squad player" at Arsenal.
Suarez joins an Arsenal team chasing a return to Champions League football. "[Suarez] is coming here because we have a lot of problems on the wing, we haven't got players to play right or left - that is the reason". "Every player has a big ambition to show their best quality".