There is also no room for Tottenham midfielder Jermaine Jenas and Portsmouth striker David Nugent.
Makeshift midfielder Andre Bikey played a neat one-two with David Nugent before slotting in Burnley's second.
Walcott, David Nugent and Routledge formed a formidable front three and the German rearguard struggled to deal with their movement.
Mawhinney's thanks were echoed by Preston chairman Derek Shaw, who was forced to sell prize asset David Nugent to Portsmouth.
David Nugent scored a superbly crafted opener as Leicester City cruised to victory over high-flying East Midlands rivals Derby County.
Portsmouth's best opportunity fell to substitute David Nugent in the closing minutes, but the striker's weak close-range shot was instinctively blocked by goalkeeper Shay Given.
These included Stoke completing a deal for keeper Begovic on a four-and-a-half-year contract, striker David Nugent's loan deal being extended at Burnley, while Tottenham re-signed central defender Younes Kaboul.
BBC: Portsmouth provide players & staff with wages assurance
Without their captain the Gunners lack their usual midfield zest and Burnley equalized six minutes after the half-time interval when David Nugent latched on to Leon Cort's header and directed the ball over goalkeeper Manuel Almunia.
After Joel Ward replaced Utaka, Reading forward Jobi McAnuff found space but flashed a right-foot drive over the crossbar before David Nugent fluffed a chance to double Pompey's lead by miscuing his volley from 12 yards out.
David Nugent was given a rare start by Portsmouth but did little to grab the attention until Pedro Mendes delightfully backheeled into his path, but his half-volley was just off target and rattled the stanchion behind the goal.
Bothroyd was a surprise inclusion, but should he feature in a team where the emphasis appears to be firmly on youth he would become the first Championship player to receive a cap since David Nugent, then of Preston, scored in a 3-0 win over Andorra in Barcelona in March 2007.
Nugent is likely to be the final Burnley signing of a transfer window that has seen them recruit David Edgar, Steven Fletcher, Tyrone Mears, Brian Easton, Richard Eckersley, Andre Bikey and Joe McKee.
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