Speculation continues to surge over the respective futures of Marouane Fellaini and Leighton Baines amid reports of continued interest from Manchester United.
And heading into Saturday's Barclays Premier League trip to Cardiff there are also rumours that Martinez is lining up a bid for Wigan midfielder James McCarthy.
Martinez said: "You always need to make sure when the window closes the squad is stronger than it was when you started. That doesn't mean you will never lose players. It means you need to be prepared for any situation."
Cardiff expect to be without new striker Andreas Cornelius who was injured in the midweek Capital One Cup win at Accrington.
Newcastle boss Alan Pardew has ordered Yohan Cabaye to be involved in his side's St James's Park clash with Fulham on Saturday.
Cabaye is also the subject of transfer speculation although Pardew refused to comment on reports that the Frenchman refused to play in last week's draw with West Ham.
Pardew said: "What I have said to Yohan Cabaye is I expect him to play this weekend. Until another bid comes in from Arsenal that is accepted or not that will be the situation."
David Stockdale is set to continue in goal for Fulham after their midweek penalty shoot-out win at Burton, as Maarten Stekelenburg battles a shoulder injury.
Stoke City boss Mark Hughes has hailed his side's start to the new season as the Potters prepare to face West Ham at Upton Park.
Hughes said: "I've been absolutely delighted with the application, first and foremost, and with the desire to really embrace everything.
"Each and every one of the players has been first-class in that regard. I can't have any complaints whatsoever."
Ricardo Vaz Te is unlikely to figure for the Hammers after handing in a transfer request in the wake of the midweek Capital One Cup win over Cheltenham.
Paolo Di Canio will name striker Steven Fletcher in his Sunderland squad for the trip to Crystal Palace after five months out, but Stephane Sessegnon is unlikely to be involved after being charged with drink-driving.
Palace boss Ian Holloway is set to miss injured pair Jerome Thomas and Yannick Bolasie as he continues to seek reinforcements, with William Gallas and Jimmy Kebe both linked.
Southampton are likely to still be without Jos Hooiveld and Guly do Prado for their trip to Norwich after the pair missed the midweek Capital One Cup win at Barnsley due to illness.
Defender Ryan Bennett is a doubt for the Canaries after being injured in the 6-3 Capital One Cup win over Bury, while Gary Hooper is still on the mend after shin problems.
Striker Robbie Brady will return to Hull City's starting line-up for the daunting trip to Manchester City after coming off the bench to score an extra-time winner at Leyton Orient in midweek.
Meanwhile, Scott Sinclair is set to make his first West Bromwich Albion start against his former club Swansea at The Hawthorns on Sunday.